Stainless Steel Tumblers Built for All-Day Cold

Insulated Tumblers | 40oz, 36Hr Cold, Leak-Proof | OISIZ

Our tumbler collection is built for people who refuse to run out of drink. The OISIZ City-pop Tumbler holds 40oz — enough to keep you hydrated through a full workday, a long commute, or an afternoon at the gym. Triple-layer vacuum insulation keeps drinks cold for up to 36 hours, and the 2-in-1 sip-or-swig lid means you drink the way you want, whenever you want.

Every OISIZ tumbler is 100% BPA free, dishwasher safe, and built with a cupholder-friendly base so it goes everywhere you go. If you're looking for a smaller everyday carry instead, our stainless steel water bottle collection starts at 20oz. And if you need a tumbler for your child, the kids tumbler collection has the Figgy Tumbler built specifically for little ones.

Available in 9 bold colors. Starting at $25.99.

Why OISIZ Tumblers Outperform the Rest

●       36-Hour Cold Performance — Triple-layer vacuum insulation technology keeps drinks ice cold for up to 36 hours. Not 24. Not 12. Thirty-six. Fill it on Monday morning, and your drink is still cold Tuesday evening.

●       2-in-1 Sip-or-Swig Lid — Straw mode for easy sipping on the go, swig mode for wide-mouth drinking when you need more. The lid seals completely in both modes — splash-resistant with the straw in, fully sealed without. The same innovative lid system found across our water bottle collection.

●       Sturdy Ergonomic Handle — Reinforced handle design built to grip comfortably and resist coming loose over time. Carry it from your car, to your desk, to the gym — without thinking about it.

●       100% BPA Free — Safe materials throughout. No BPA, no odors, no chemical taste in your drink — just clean hydration every time.

●       Dishwasher Safe — The tumbler is fully dishwasher safe — just toss it in and let the machine do the work. Wide-mouth opening also makes hand washing effortless. Need a replacement tumbler lid? We stock that separately.

●       Cupholder Friendly — The 40oz base is designed to fit most standard car cup holders. Your commute just got a lot more hydrated.

●       9 Bold Colors — From Sunset to Space Grey, Neo Sage to Mojito — pick the color that fits your vibe. Every tumbler is a statement piece that actually performs.

Meet the OISIZ Tumbler Range

OISIZ offers tumblers for adults and for kids — each designed for its audience, all sharing the same commitment to quality and performance.

City-pop Tumbler — 40oz (Adults)

The City-pop Tumbler 40oz is our flagship adult tumbler — big enough to last the whole day, smart enough to go anywhere. Triple-layer insulation keeps drinks cold for 36 hours. The 2-in-1 sip-or-swig lid gives you two ways to drink. The reinforced handle gives you one comfortable way to carry it. Available in 9 vibrant colors, it's the tumbler for people who refuse to settle for boring.

●       Capacity: 40oz — full-day hydration without refills

●       Insulation: Triple-layer vacuum — cold up to 36 hours

●       Lid: 2-in-1 sip-or-swig lid with flexible silicone straw

●       Handle: Reinforced ergonomic handle — comfortable and durable

●       Base: Soft rubber base — quiet set-down, scratch-free surfaces

●       Material: Stainless steel, BPA free

●       Colors: 9 options — Sunset, Navy Blue, Rosered, Purple, Mint, Grapefruit, Neo Sage, Mojito, Space Grey

●       Best for: Office, commute, gym, road trips, all-day outdoor use

Figgy Tumbler — 14oz (Kids)

Looking for a tumbler for your child? The Figgy Tumbler 14oz is designed specifically for kids — BPA free, leak-proof, and built in a size that's easy for small hands to hold. You can find the full kids tumbler range, including the Figgy, in our dedicated kids tumbler collection.

●       Capacity: 14oz — perfect for kids

●       Features: BPA free, leak-proof, 24-hour cold, cupholder friendly, dishwasher safe

●       Best for: School, sports, lunchboxes, everyday use for kids

Simple to Use. Built to Last.

1  Choose Your Color

Pick from 9 bold colors — from classic Navy Blue and Space Grey to vibrant Sunset and Mojito. Not sure which OISIZ product is right for your lifestyle? Our guide to OISIZ tumblers covers what makes each option different.

2 Fill It Up

The wide-mouth opening makes it easy to add ice, pour drinks, and clean thoroughly. Fill with water, cold brew, iced tea, juice — whatever you're drinking today. Triple-layer insulation will keep it cold for up to 36 hours.

3  Pick Your Lid Mode

Pop the flexible silicone straw in for straw mode — ideal for sipping while driving or working. Or remove the straw and drink in swig mode for bigger gulps at the gym or on a hike. The lid seals completely in both modes.

4  Grab the Handle & Go

The reinforced ergonomic handle makes carrying your 40oz tumbler effortless — from your kitchen to your car to your desk. The cupholder-friendly base means it slots into any standard car cup holder without fuss.

5  Clean Without Thinking

Fully dishwasher safe — lid, straw, and tumbler body. Or hand wash using the wide-mouth opening with a standard bottle brush. If you ever need a replacement lid for your City-pop Tumbler, we stock it in our accessories collection.

Trusted by Thousands. Built to Last a Lifetime.

Every OISIZ tumbler is backed by our lifetime warranty. If anything ever goes wrong due to a manufacturing defect, we'll replace it — no fine print, no hassle. For answers on care, cleaning, and compatibility, visit our FAQ page.

●       2025 Muse Design Award — Silver Winner for the Vic-wing Bottle — the same design philosophy powers every OISIZ product, including our tumblers.

●       Lifetime Warranty — We back every tumbler for life. Manufacturing defect? Replaced. No questions asked.

●       Fast USA Shipping — Ships within 1-2 business days. Delivered in 3-7 business days across the USA.

●       Dishwasher Safe — Fully dishwasher safe — lid, straw, and tumbler body. No complicated hand-wash-only rules.

●       Solar-Powered Manufacturing — Every OISIZ product is manufactured using processes powered in part by clean solar energy — reducing CO₂ emissions by approximately 100.9g per unit. The same eco commitment runs across our water bottle and kids water bottle collections.

●       Real Customer Reviews — Every review on our site is from a verified buyer. No fake stars, no incentivized reviews.

Ready to Stop Refilling and Start Drinking?

40oz of ice-cold hydration. Triple-layer insulation. 2-in-1 lid. Ergonomic handle. Dishwasher safe. Lifetime warranty. Starting at $25.99. Pick your color and upgrade your hydration today. Looking for something smaller to carry on the go? Check out our stainless steel water bottle collection. Need something for the whole family? Browse our kids water bottle range or shop Christmas gift sets for everyone on your list.

"I've had mine since September 2024 — it's been the best tumbler I've ever had. It stays cold all day, doesn't spill, and goes in the dishwasher. Nothing else comes close."

— verified buyer, USA