You toss your tumbler in a bag, and an hour later your laptop sleeve is soaked in iced coffee. Sound familiar? Here's the truth about tumblers and leaks.
The short answer
Most tumblers are spill-resistant, not leak-proof. A good lid keeps drinks in when the tumbler is upright or gets bumped, but sip openings and straw holes will leak if it tips over or rides sideways in a bag. For true leak-proof carry, you need a lid with a gasket and a fully sealing closure, or a screw-top bottle.
| Term | What it means | Good for |
|---|---|---|
| Leak-proof | A sealed lid with a gasket and a closed opening. No leaks even upside down. | Bags, backpacks and car rides |
| Spill-resistant | The lid limits splashes, but it can drip or leak if tipped | Desks, cupholders and walking around |
| Open or straw lid | Leaks if it tips over | Sitting on a table |
If it isn't labeled leak-proof, don't trust it in your bag.
Leak prevention tips
☐ Re-seat the gasket every time you wash the lid
☐ Don't fill it all the way to the rim
☐ Close the slider before you walk
☐ Carry it upright
☐ Be careful with hot and fizzy drinks, since pressure can push liquid out of the lid
A good lid does double duty, too. The same seal that stops leaks helps hold temperature. Here's how tumbler lids affect insulation.
Need something that can ride in a bag? A bottle with a screw-on cap is the safer bet. Here's how a thermos compares to a tumbler.
Can I put my tumbler in my bag?
Only if it's labeled leak-proof and the lid is fully closed. Otherwise, carry it upright.
Why does my tumbler leak from the lid?
Usually a gasket that isn't seated, a lid that isn't pushed on all the way, or an open sip or straw hole.
Do tumblers leak if they tip over?
Most do, a little, unless they have a fully sealing lid.
Drinkware your team will actually carry
Tell us the colors, the quantity and your logo. Our 20 oz and 30 oz tumblers include a 3″ laser engraving.