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FAQ
PRODUCT INFORMATION
1. 1 Are OISIZ bottles dishwasher-safe?
Most of our products are designed to be dishwasher safe. Only a few products that have special finishing will need hand washing. You can find the specific information on each product’s page.
1.2 Does OISIZ bottle test for lead?
Yes, OISIZ bottle passed CPSC and FDA tests for lead, it's also BPA-free, no-toxin and dishwasher safe.
1.3 Are OISIZ bottles BPA Free?
All of our products is free from bisphenol compounds such as BPA, BPS, and BPF. Cheers to that!
1.4 Are OISIZ bottles microwave-safe?
The stainless-steel bottles should never be microwaved.
1.5 Are OISIZ bottles freezer safe?
Stainless Steel: We’re assuming that if you want to freeze your bottle, it’s because you want your liquids to be cold. But here’s the thing: our stainless-steel bottles are triple-layer insulated, which means that the liquids are insulated from the temperature outside of the bottle. So while yes, the bottle is technically freezer safe, we just recommend putting a few ice cubes in the bottle instead.
1.6 How long will it keep my drinks hot and cold？
All our bottles feature a triple-walled, vacuum-insulated design with copper lining, ensuring your beverages stay cold for up to 24 hours and hot for up to 12 hours.
Some products are designed with straws, to prevent the risk of burns, we do not recommend using them for hot drinks.
1.7 What are the instructions for use?
Do not use harsh chemicals (such as bleach, abrasives, etc.).
- Wash before use. Lid is top-rack dishwasher safe. Hand washing the cup is recommended to preserve its finish.
- Do not microwave, freeze, or boil.
- Not for use with hot, carbonated, or perishable liquids.
- Avoid accidental opening on the bottle by keeping the button free and clear or other objects.
- Cover the button with the loop to help avoid accidental pushing of the button.
- When opening the bottle, keep fingers away from the recess behind the spout cover.
Warnings
- The straw allows generous amounts of liquid to be drawn suddenly into the mouth from the bottom of the bottle where the temperature of hot liquids is usually higher than it is at the liquid's surface.
- Drinking hot liquids presents a risk of injury.
- Hot, carbonated, and perishable liquids and other contents may build up pressure within the bottle and unexpectedly leak or spray out. Pressurized contents also may cause the spout cover to open rapidly enough to injure fingers positioned in or near the recess behind the spout cover. Always open with caution.
1.8 How often do I need to wash my OISIZ bottle?
How often do you shower? Daily seems like a good idea…but that’s up to you.
1.9 How do I clean the different parts of my OISIZ bottles?
OISIZ brand products are designed to be as simple and easy to clean as possible. Best practices for cleaning each part may vary.
Lids: All lids are top-rack dishwasher safe. For a more thorough cleaning, use a sponge or straw brush to access the nooks or smaller spaces.
Straws: The straws can be easily removed and put in the dishwasher’s silverware bin. You can use the gifted small brush to clean the inside of straw.
Cup: the cup is made of stainless steel, most of them are top-rack dishwasher safe. Some of the cups with special finishing need hand-wash with warm, soapy water.
1.10 What sizes are available and how do I choose?
OISIZ bottles come in a range of sizes — here's the quick guide to finding your perfect fit:
- 10oz / 14oz / 18oz (Kids — Rainbow Kids Bottle)
The smaller sizes are designed for little hands and school bags. The 10oz fits in most backpack side pockets (2.9"W x 6"H). Great for daycare, preschool, and on-the-go toddlers. - 14oz (Kids — Figgy Kids Tumbler)
Our bestselling kids tumbler. 2.8"W x 8"H, fits standard cup holders and school bag pockets. Perfect for school-aged kids who want a fun straw lid with a dust-proof cover. - 20oz / 24oz (Adult — Vic-wing Bottle )
The everyday heroes. Featured in our Sip-or-Swig lid, 20oz/24oz fits most cup holders — the standout choice for those who want style and substance. Perfect for the gym, office, or outdoor adventures.
Quick tip: If you're buying for yourself and want one bottle for everything, go for the 20oz or 24oz. For kids, the 14oz Figgy is the sweet spot — big enough for a school day, compact enough for little hands.
1.11 Can I put coffee or hot drinks in it?
Yes! OISIZ insulated bottles are built to keep both cold drinks cold and hot drinks hot. One heads-up though — for our straw lid bottles, please don't drink beverages over 45°C / 113°F for safety reasons. Also, if you've been holding anything other than plain water in the bottle, give it a thorough wash after each use to prevent odors and bacteria. A quick rinse with warm soapy water does the trick — easy and keeps your bottle fresh!
1.12 Can I use it for sports, outdoor activities, or commuting?
Absolutely. OISIZ bottles are built for an active lifestyle — leak-proof, durable, and temperature-resistant. Whether you're hitting the gym, heading to the office, or exploring the outdoors, there's an OISIZ bottle made for your vibe.
1.13 Will it fit in my car's cup holder or backpack?
Most OISIZ bottles are designed to fit standard car cup holders and side pockets on most backpacks. Check the specific dimensions on each product page to make sure it's a match.
1.14 How long does it keep drinks cold / hot?
All OISIZ bottles use triple-wall vacuum insulation with copper lining — cold for up to 24 hours, hot for up to 12 hours.
1.15 What's the difference between the Figgy Kids Tumbler and the Rainbow Kids Bottle?
Both are made with premium SUS 316 stainless steel for the interior — super corrosion-resistant and easy to clean, safe for juices and beverages. The key differences:
Figgy Kids Tumbler ($21.99, 14oz):
- Soft silicone straw with dust-proof cover — great for little ones
- Transparent lid so parents can easily check water level
- 4 unique OISIZ Planet characters (Selena, Frank, Leo, Astra) with their own stories
- Kid-friendly grip handle
- Comes in 8 vibrant colors
Rainbow Kids Bottle ($18.99+, 10oz / 14oz / 18oz):
- Compact sizes perfect for school bags and small hands
- Leak-proof straw lid with wide opening for easy cleaning and ice
- Silicone carry loop
- More color options to pick from
Both are 100% leak-proof, BPA/lead/phthalate-free, cupholder-friendly, and dishwasher safe!
1.16 What age is the Figgy Kids Tumbler for?
Figgy is designed for kids and toddlers — the 14oz size (2.8"W x 8"H, 0.71 lbs) fits most school bag side pockets and standard cup holders. The soft silicone straw is gentle on little teeth, and the straw lid is 100% leak-proof so no more mystery puddles in the backpack.
1.17 What makes Vic-wing different from other OISIZ bottles?
The Vic-wing Bottle ($24.99, 24oz) features our patented 2-in-1 Sip-or-Swig lid — flip it to sip through the straw or open wide to swig directly. Here's what else sets it apart:
- One-hand opening — flip it open with one hand while driving
- Locking buckle — enhanced leak-proof safety, lid won't pop off even if dropped
- Foldable handle — ergonomic, wide-edge design for comfort carry
- Silicone non-slip bottom — quiet, crash-proof set-down
- Cupholder friendly — fits most car cup holders
- Dishwasher safe (lid top-rack)
- Lifetime warranty
1.18 What type of stainless steel do you use?
OISIZ uses high-quality stainless steel:
- Adult bottles: 18/8 stainless steel (durable, corrosion-resistant)
- Kids bottles: SUS 316 interior (extra corrosion-resistant, ideal for juices and dairy) with 18/8 exterior. We chose 316 because it's more expensive but gives parents peace of mind — it's easier to clean and more resistant to lingering flavors and odors.
All OISIZ products are BPA-free, lead-free, and phthalate-free, and have passed CPSC and FDA testing.
1.19 Will the bottle rust or develop an odor over time?
The high-quality 18/8 stainless steel interior is corrosion-resistant and won't rust with normal use. Regular cleaning keeps it fresh and odor-free. Hand wash with warm soapy water is recommended for the cup body to maintain its finish.
TROUBLE SHOOTING
2.1 Why I can't suck water from my kid's water bottle?
A couple of potential reasons for the difficulty of sucking water from the bottle.
- Air Valve on the Lid: Please take a look at the attached picture of the air valve on the lid (on the back of the lid). Ensure that there is a small hole present in the air valve. If there is no hole, this could be the reason your child is having trouble extracting water from the bottle. You can use a needle to gently clear any blockages in the air hole.
- Transparent Spout: While it’s a rare occurrence with new bottles, sometimes the transparent spout may not be positioned correctly. This typically happens when parents disassemble the spout for cleaning and then reassemble it. Please check to ensure that the spout is well-positioned. When reattaching the spout, Try applying more pressure when pushing the spout until you hear the click and notice there’s no gap between the spout and the silicone part. You should feel resistance when flipping the spout, indicating it’s fully attached.
You can see the full troubleshooting tips at the following link:
https://youtube.com/shorts/PVWoX_I4RNs?feature=share
2.2 Are your products leak-proof?
Our products should be 100% leak-proof when the lid and flip cap are properly closed. If you experience any leaking, please check if the seal ring on the lid is correctly positioned. If this does not resolve your issue, please contact our customer service team for assistance.
SHIPPING
3.1 When will my order ship?
In the United States, in-stock items usually shipments take about 3-5 business days from the date of fulfillment. For a more specific answer, use the tracking number that was provided with your receipt.
3.2 What are my shipping choices?
We offer ground shipping 3-5 days.
3.3 How will I know my order is on its way?
Once shipped, you'll receive an email with tracking details and the carrier information.
3.4 Where does OISIZ ship to?
United States, Canada and Mexican
Wholesale
3.5 How can I check, update, change, or cancel my order?
We get it, mistakes happen all the time!
If you placed your order within the last 10 mins it’s possible that you can still make changes to your order by emailing us at order@oisiz.com.
If it has been a little longer, chances are that your order is a little too far along the fulfillment process for us to make changes. If you couldn’t make changes to your order please submit a return request. We’re more than happy to take care of all the return arrangements. To request a return label, click here. In the meantime, you can check on the status of you order by clicking here.
3.6 My order says it's delivered, but I don't have it!
If your tracking shows "delivered" but it's missing, please allow 24 hours for delivery. Also, check with neighbors or household members who might have received it for you. If it's still not found, contact Customer Support.
3.7 What if my order is wrong or damaged?
If something's not right with your order, don't hesitate to contact Customer Support, and we'll help you resolve the issue.
3.8 Do you ship internationally?
Yes! Currently shipping to the US, Canada, Mexico, UK, Germany, and France. Product availability may vary by location. Questions? Email us at service@oisiz.com.
3.9 Do you offer free shipping?
Free shipping on all US orders over $39.99 — just grab any two items! International shipping available at checkout.
3.10 Will the paint or finish scratch off?
OISIZ bottles feature durable powder-coat finishes built to last through daily use. Like any finish, heavy abrasion (like scraping against rough surfaces) may cause wear over time — a little care goes a long way to keep it looking great.
Just one thing to watch out for: never put the bottles in boiling water, as it can cause the finish to peel. Stick to your normal dishwasher cycle and you'll be all set!
3.11 Do the seal rings or lids need to be replaced? How often?
The seal rings are designed to last through normal use. With regular cleaning and proper care, they should hold up well. If you notice any wear, cracking, or reduced sealing performance, reach out to service@oisiz.com — we'll help you figure out the next step.
3.12 What makes OISIZ different from Hydro Flask, Stanley, or YETI?
Great question! Here's how we stack up:
- Material & Safety: OISIZ Kids bottles use SUS 316 stainless steel interior — more corrosion-resistant and easier to clean than standard 18/8, ideal for juices and dairy. Adult bottles use 18/10 stainless steel for superior durability.
- Kid-Approved Design: Our Figgy Kids Tumbler and Rainbow Kids Bottles are specifically built for little ones — soft silicone straws, dust-proof covers, transparent lids, and 4 unique OISIZ Planet characters (Selena, Frank, Leo, Astra) that make staying hydrated fun.
- Smart Features: Vic-wing Bottle features our patented 2-in-1 Sip-or-Swig lid — sip or swig in one bottle. One-hand opening and locking buckle for on-the-go ease.
- Warranty: All OISIZ bottles come with a lifetime warranty — we're proud of our quality and we've got your back.
- Value: Premium materials and thoughtful design at a price that won't break the bank.
3.13 Will my bottle retain flavors or odors from coffee, juice, or milk?
The high-quality stainless steel interior is designed to resist flavor retention. That said, a few tips to keep your bottle fresh:
- Give it a good rinse and wash with warm soapy water after holding anything other than plain water — especially milk, juice, or smoothies.
- For deep cleaning, use a bottle brush on the interior and a small brush for the straw.
- If odors do build up, a mixture of baking soda and water works wonders — let it sit for a bit, then scrub and rinse thoroughly.
- The 316 stainless steel in our Kids bottles is especially easy to clean and resistant to lingering flavors — perfect for parents dealing with milk or juice residues.
3.14 Will the bottle sweat or condensation on the outside?
Nope! OISIZ insulated bottles won't sweat — the triple-wall vacuum insulation keeps the exterior completely dry, so you don't have to worry about moisture on the outside or wet bags. Just pure cold (or hot) drinks, no mess.
3.15 Do you offer gift packaging or gift boxes?
Yes! Our special edition collections — like Christmas and Spring Collection — come in special gift-ready packaging, perfect for gifting. Check the product page for the specific edition you're interested in to see if it includes special packaging.
Looking for something more personal? We also offer corporate gifting with custom engraving — reach out to our team at service@oisiz.com and we'll put together something special for you.
3.16 Can I buy replacement lids, straws, or brushes separately?
Yes! Replacement lid parts are available — check out our accessories collection right here: https://www.oisiz.com/collections/accessories
We currently don't carry cleaning brushes, but most OISIZ bottles are wide-mouth enough for easy hand washing or a quick scrub with a standard bottle brush from any home goods store.
3.17 Is OISIZ eco-friendly?
Absolutely — sustainability is at the core of what we do:
- One bottle, hundreds less in landfills: Each OISIZ bottle is designed to replace single-use plastic bottles. One bottle = hundreds of plastics saved from the trash.
- 316 stainless steel = 100% recyclable: Our Kids bottles use premium 316 stainless steel, which is 100% recyclable.
- Solar-powered production: This OISIZ bottle is produced using manufacturing processes powered in part by clean solar energy. By integrating solar power into our production, we avoid approximately 100.9 grams of CO₂ emissions per bottle compared to conventional grid electricity — a measurably lighter environmental footprint from day one.
We're committed to doing better for the planet, one bottle at a time. Check out our OISIZ impact page to learn more about our impact initiatives. 🌍
3.18 Can I put ice cubes in it? What size?
Yes! The wide-mouth opening on most OISIZ bottles (2.9" diameter) makes it easy to add regular-sized ice cubes — no need to break them up. Just drop them in and enjoy ice-cold water for up to 24 hours. The wide opening also makes cleaning a breeze.
3.19 Is it heavy / how much does it weigh?
Weight depends on the size and model:
- Rainbow Kids Bottle 10oz: 0.63 lbs (286g)
- Figgy Kids Tumbler 14oz: 0.71 lbs (322g)
- Rainbow Kids Bottle 14oz: 0.66 lbs (300g)
- Vic-wing Bottle 20oz: 0.79 lbs (358g)
- Vic-wing Bottle 24oz: 1.08 lbs (490g)
The Kids bottles are lightweight enough for little hands, and the adult bottles are designed for easy carrying — the Vic-wing even has a foldable handle!
3.20 Do you offer personalization or custom engraving?
Exciting news — this service is coming soon! ✨ For now, we offer bulked orders with personalization or custom engraving — perfect for corporate gifts, team events, or brand swag. Reach out to our team at service@oisiz.com for more information.
Note: Customized products are non-refundable, so please double-check all details before placing your order.
RETURN
4.1 What's your return policy?
Any unused OISIZ bottle in its original packaging can be returned for a full refund within 14 days of the original purchase date. Once we receive your return, we will process your refund within 10 business days.
To initiate the return process, please file a return request by clicking here.
4.2 Can I return my OISIZ drinkware if I've already used it?
Unfortunately, we cannot accept returns for used items due to hygiene and safety reasons. However, if you encounter any issues with your Hydrapeak product, please contact our customer service team for assistance.
4.3 What if I received my OISIZ drinkware and there are missing or damaged parts?
We apologize for any inconvenience. Please contact our customer service team within 14 days of receiving your order, and we will be happy to assist you with a replacement or refund.
4.4 Can I return my OISIZ drinkware if I changed my mind about the color or size?
We accept returns for unused and unopened items within 14 days of purchase. Please ensure that all packaging materials and accessories are included and intact.
4.5 How do I initiate a return for my OISIZ drinkware?
To initiate a return, please go to the return page and fill in the form as instructed.
4.6 What if my OISIZ drinkware gets damaged after I've used it?
Our OISIZ drinkware is designed to withstand normal wear and tear with proper care. However, if you encounter any issues with your product, please fill in the form of warranty and we will do our best to assist you with a solution.
4.7 What is your policy on returning personalized or custom-engraved OISIZ drinkware?
Unfortunately, we cannot accept returns for personalized or custom-engraved items unless they arrive damaged or defective. Please double-check all personalization details before placing your order.
4.8 How long does it take to process a return and receive a refund?
Once we receive your returned item, please allow up to 5-7 business days for processing. Refunds will be issued to the original form of payment used for the purchase.
WARRANTY
5.1 What is your warranty policy?
We’re proud of the quality and craftsmanship of our bottles and stand behind each bottle we manufacture. If you’re unsatisfied with your product, or if you’ve encountered a manufacturing related issue, please submit a warranty claim and our experts will carefully review your case. While we’ll be extra gracious with your claim, please be aware that there are certain damages we can’t cover. Some of these damages include:
• Accidental damage
• Improper care or misuse
• Normal wear and tear
Not sure if your case will be covered under warranty? Submit a claim anyways and our team will help you with alternative solutions on the off chance we can’t cover the damages under warranty.
5.2 How can I claim warranty service for my OISIZ product?
To initiate a warranty claim, please fill out the Warranty Claim Form. Please allow 24-48 hours for a response from our team.
5.3 Are there any limitations to the warranty coverage?
Yes, our warranty is only applicable to the original purchaser of the OISIZ product and is non-transferable. Additionally, we reserve the right to determine the validity of warranty claims and to provide remedies at our discretion.
5.4 Where can I purchase OISIZ products covered under the warranty?
Our warranty is valid only for products purchased directly from Hydrapeak or authorized retailers. Purchases from unauthorized sellers are not covered under this warranty.
5.5 What payment types do you accept?
We accept all major credit cards. We also accept debit cards, Apple Pay and Google Pay. No cash or check—unless you’re willing to make the trek to our headquarters, then we might be willing to make an exception.
PROMOTIONS & REWARDS
6.1 Do you have any active discounts or promotions?
You bet! Here's what's on:
- 10% off your first order when you sign up for our email list
- $5 off when you refer a friend — they save $5 too with your referral link
- Rewards program: Earn points with every purchase and redeem them for future discounts. The more you spend, the more you save! Check out the details at https://www.oisiz.com/pages/rewards
6.2 Do you offer wholesale or corporate gifting?
Yes, we do! OISIZ offers wholesale pricing and corporate gifting programs — perfect for teams, events, or brand swag. Reach out to our team at service@oisiz.com and we'll put together a custom quote for you.