Shop By Size – ThermoFlask

Free Shipping Orders $49+ (U.S. Only)

Buy One, Get Customization Free On A Second Item!* Ends 9/2

*Offer valid from 8/29/25 through 9/2/25 at 11:59 PM PT. Buy one item with customization and receive free customization on a second item of equal or lesser value. Discount applies to customization charges only; product prices are not discounted. Limit 10 customized items per order. Only one side of customization is eligible for the discount per item. If both sides are customized, only one side will be discounted. Discount automatically applied at checkout. Offer valid only on purchases made at MyThermoFlask.com. Cannot be combined with other offers or discounts. No adjustments on previous purchases. Terms subject to change without notice.

Shop By Size

From quick sips to all-day hydration, find the size that works for you.

Shop Best Selling Sizes

10oz / Jet Black

10oz Lowball Tumbler

Jet Black

10oz Lowball Tumbler

$19.99

$19.99

10oz / Jet Black

10oz Lowball Tumbler

Dusty Blue

10oz Lowball Tumbler

$19.99

$19.99

12oz / Jet Black

12oz Coffee Mug

Jet Black

12oz Coffee Mug

$24.99

$24.99

12oz / Pitch Black/Coral Sands

12oz Coffee Mug 2 Pack

Stone/Sea Kelp

12oz Coffee Mug 2 Pack

$29.99

$29.99

12oz Mountain Spring + Ocean/Ocean + Sunrise

12oz Food Jar 2 Pack

Mountain Spring + Ocean/Ocean + Sunrise

12oz Food Jar 2 Pack

$39.99

$39.99

64oz Cool Gray

64oz Straw Bottle

Cool Gray

64oz Straw Bottle

$39.99

$39.99

64oz Cool Gray

64oz Straw Bottle

Purple Sunset

64oz Straw Bottle

$39.99

$39.99