Kids Water Bottles 

Kids Water Bottles | BPA Free, Leak-Proof & Safe | OISIZ

Our kids water bottle collection is designed for parents who refuse to compromise on safety. Every bottle is made from food-grade 316 stainless steel — completely BPA free, lead-free, and phthalate-free — so you never have to think twice about what's going into your child's drink. Whether it's water, juice, or milk, every sip is clean.

From the Rainbow Kids Bottle in 10oz, 14oz, and 18oz to colors your child will actually want to carry — OISIZ kids bottles are built tough enough for lunchboxes, backpacks, and every school adventure. If you're shopping for older kids or need something more versatile, our kids tumbler collection is worth a look too.

Cold for 24 hours. Truly leak-proof. Dishwasher-safe. Starting at $19.99.

Why Parents Choose OISIZ Kids Water Bottles

316 Surgical-Grade Stainless Steel — OISIZ kids bottles use 316 steel — the same grade used in medical and food equipment. More corrosion-resistant than standard 304 steel, and far superior to plastic. Perfect for juice, milk, and water without lingering odors or flavors.

●       100% BPA, Lead & Phthalate Free — Zero harmful chemicals in any component. Every OISIZ kids bottle is CPSC tested and FDA compliant, so every sip your child takes is genuinely safe.

●       Truly Leak-Proof Lid — The lid locks shut with a secure locking mechanism. Toss it in the backpack or lunchbox upside down — nothing leaks, ever. If your child also needs a no-spill drink cup, check out our kids tumbler range for more options.

●       Cold for 24 Hours — Double-wall vacuum insulation keeps drinks cold from morning drop-off to after-school pickup — and beyond. No sweating on the outside, no wet lunchboxes.

●       Dishwasher Safe — Lid and straw go straight into the dishwasher. The bottle body is easy to hand wash. If you ever need a replacement lid or straw, we have those too.

●       Designs Kids Actually Love — Vibrant rainbow gradients and bold solid colors — enough options that every child picks a favorite and actually wants to carry it.

Built for Every Stage — Pick the Right Size

OISIZ kids water bottles come in three sizes to suit different ages, needs, and lifestyles. All three share the same 316 stainless steel construction and leak-proof lid system.

Rainbow Kids Bottle — 10oz

Our 10oz Rainbow Kids Bottle is the ideal choice for toddlers and very young children (ages 2–4). It's compact, lightweight, and sized perfectly for small hands. The soft silicone straw makes it easy to drink without any spills, and the secure locking lid means parents can pop it in a bag without a second thought.

●       Best for: Toddlers, ages 2–4, nursery, short outings

●       Key specs: 316 stainless steel | Double-wall insulation | BPA-free straw lid | Dishwasher-safe lid & straw

Rainbow Kids Bottle — 14oz (Most Popular)

The 14oz Rainbow Kids Bottle is our best-selling kids bottle — and for good reason. It's the sweet spot size for school-age children (ages 5–10): big enough to last a full school day, compact enough to fit any lunchbox or backpack side pocket. The transparent spout makes it easy to check the lid is sealed before heading out.

●       Best for: School-age kids, ages 5–10, school days, sports, outdoor play

●       Key specs: 316 stainless steel | Double-wall insulation | BPA-free straw lid | CPSC tested | FDA compliant

Rainbow Kids Bottle — 18oz

For older kids and active children who need more throughout the day, the 18oz Rainbow Kids Bottle is the right pick. Great for full school days, long sports sessions, or trips where refilling isn't always convenient. Same trusted build as the 14oz — just more capacity.

●       Best for: Older kids ages 10+, sports, all-day use

●       Key specs: 316 stainless steel | Double-wall insulation | BPA-free straw lid | Fits standard cup holders

  Size Guide at a Glance  

●       10oz → Toddlers (ages 2–4) — Shop 10oz

●       14oz → School-age kids (ages 5–10) — Shop 14oz

●       18oz → Older & active kids (ages 10+) — Shop 18oz

Simple for Kids. Smart for Parents.

 1  Choose Your Size - Start with the right size — 10oz for toddlers, 14oz for the school bag, or 18oz for older and more active children. Not sure which to pick? Our guide to choosing the best kids water bottle walks you through exactly what to look for.

2  Fill It Up - Fill with cold water, juice, or milk. The wide mouth opening makes it easy — no funnels, no mess. Add ice cubes and the double-wall insulation will keep everything cold for up to 24 hours.

3  Lock the Lid - Snap the straw cap shut and lock it. The locking mechanism prevents the lid from opening accidentally inside a bag or lunchbox. Kids sip through the soft silicone straw — gentle on teeth and easy to use.

4  Into the Bag - No sweating on the outside (triple-wall insulation keeps the exterior dry), no leaks inside the bag. The bottle fits standard cup holders and most backpack side pockets. Parents who also want an adult option will find our stainless steel water bottle collection uses the same quality build.

5  Clean It Fast - Lid and straw go in the dishwasher. Hand wash the bottle body. If milk or juice residue builds up, a baking soda soak for 15 minutes clears it out — the 316 stainless steel resists odors effectively. Need a fresh replacement straw or lid? We stock those separately.

Built Safe. Tested Safe. Certified Safe.

When it comes to your child's health, we take zero shortcuts. Every OISIZ kids bottle is tested to the highest US safety standards. For the full breakdown of our safety testing and care instructions, visit our FAQ page.

●       CPSC Tested — Every OISIZ kids bottle meets Consumer Product Safety Commission standards — the federal safety benchmark for children's products in the USA.

●       FDA Compliant — Food-safe materials approved by the US Food and Drug Administration. Safe for water, juice, and milk.

●       BPA Free — Zero BPA. The interior is 316 stainless steel throughout — no plastic ever touches your child's drink.

●       Lead & Phthalate Free — Tested and confirmed free of lead and phthalates in every component — including straw, lid, and seals.

●      316 Stainless Steel Interior — We chose 316 specifically for kids bottles because it's more corrosion-resistant, especially with juice and dairy.

●      No Sweat on the Outside — Triple-wall insulation means zero condensation on the bottle exterior. Dry bags, dry lunchboxes every time.

Teaching Kids to Choose Better — From Day One

Every OISIZ kids water bottle replaces hundreds of single-use plastic bottles over its lifetime. When your child carries an OISIZ bottle, they're learning that everyday choices matter — for their health and for the planet. Our stainless steel water bottles for adults are built on the same principle.

Our kids bottles are manufactured using processes powered in part by clean solar energy, reducing CO₂ emissions by approximately 100.9 grams per bottle compared to conventional manufacturing. And because every bottle is designed to last years — not months — the positive impact compounds over time.

●       Solar-Powered Manufacturing — Cleaner production from day one.

●       500+ Plastic Bottles Replaced — One OISIZ bottle eliminates hundreds of single-use plastics over its lifetime.

●       100% Recyclable Steel — 316 stainless steel is fully recyclable at end of life. Zero waste.