The fit database · last verified July 2026

Will yours fit?
Measured, sourced, settled.

Every verdict below comes from a measured or manufacturer-documented base diameter — not a guess, not “fits most cups.” The rule it all runs on:

Container bases 2 to 3 inches across settle in fully. The flexible fins accept slightly wider bases up to 3.15 inches — a snug fit that seats with a push. Under 2 inches sits too loose; over 3.15 doesn’t seat. Flex ceiling physically calibrated by the founder, July 2026.

The five-second home test: a square sticky note is exactly 3 inches. Base sits inside the square — it settles in fully. A hair over the edge — check its row below for a snug verdict. Measure the bottom, not the rim: bottles taper and tumblers flare.

Settles in fully — 22 containers

Fits · base 2″ to 3″

Red Bull 8.4 oz can2.08″industry standardFits

Simple Modern Trek 40 oz Tumbler2.14″retailer specFits

Alani Nu 12 oz slim can2.25″industry standardFits

Celsius 12 oz slim can2.25″industry standardFits

slim 12 oz seltzer can (White Claw style)2.26″manufacturer specFits

16 oz pint glass (standard mixing glass)2.38″retailer specFits

standard 12 oz beer longneck bottle2.41″retailer specFits

Monster Energy 16 oz can2.60″industry standardFits

Red Bull 16 oz can2.60″industry standardFits

Red Bull 12 oz can2.60″industry standardFits

Liquid Death 16.9 oz tallboy can2.60″industry standardFits

La Croix 12 oz can2.60″industry standardFits

Arizona 23 oz tall can2.60″industry standardFits

Topo Chico 12 oz glass bottle2.60″retailer specFits

Bang Energy 16 oz can2.60″industry standardFits

standard 12 oz aluminum can2.60″manufacturer specFits

Starbucks bottled Frappuccino 13.7 oz2.61″retailer specFits

Yeti Rambler 20 oz Tumbler2.75″retailer specFits

Yeti Rambler 30 oz Tumbler2.75″retailer specFits

Coke 20 oz plastic bottle2.86″retailer specFits

vitaminwater 20 oz bottle2.88″retailer specFits

Stanley 40 oz H2.0 FlowState Quencher Tumbler3.10″retailer specFits

A can’s true table-contact footprint runs about a tenth of an inch narrower than its body diameter (the chime taper) — which is why every standard can seats with room to spare.

The snug tier — seats with a push

3″ to 3.15″ · the fins flex

Owala FreeSip 24 oz3.12″manufacturer specSnug — seats with a push

Stanley 30 oz H2.0 FlowState Quencher3.15″retailer specSnug — seats with a push

Snug is a feature at this width — the fins are working hardest exactly where the container is heaviest. Push it in; it seats. The Stanley 40 oz Quencher (3.1″) sits just under this tier and settles in fully.

The honest no’s — 10 containers

Doesn’t seat — and we’d rather you know now

Stanley IceFlow 30 oz Flip Straw Tumbler3.20″retailer specToo wide

CamelBak Chute Mag 32 oz3.31″retailer specToo wide

Yeti Rambler 26 oz Bottle3.38″measured-reviewToo wide

Ball regular-mouth Mason jar (16 oz)3.38″retailer specToo wide

Owala FreeSip 32 oz3.43″manufacturer specToo wide

Gatorade 28 oz squeeze bottle3.45″retailer specToo wide

Nalgene 32 oz Wide Mouth3.50″manufacturer specToo wide

Hydro Flask 32 oz Wide Mouth3.58″retailer specToo wide

Classic handled coffee mug—founder-verifiedHandle in the way

Espresso cup—founder-verifiedHandle in the way

The 32 oz wide-mouth Nalgene is the miss this board feels most — 3.5″ is past even the flex. Handled mugs are the familiar one: the base is in range, but the handle lands exactly where a fin needs to close.

Your cup checked out?

One base holds all of it — the can at the sandbar, the tumbler on the dawn paddle, the bottle on the drift. Free shipping, 90 days to prove it on your own board.

Get one on the board — from $14.95

Will yours fit?Measured, sourced, settled.