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The fit guide

Will yours fit? Here's the whole answer.

One spec, one desk-drawer test, and the exact measurements for the cups and cans people actually bring. Every number below is sourced — nothing is guessed.

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.

The 10-second version

The whole fit test is one sticky note off the pad.

your cup's base
lands in here
  1. Grab a sticky note. The classic square is exactly 3 inches on a side — a fact about sticky notes, and it happens to land right at the ceiling of what fits.
  2. Set your cup on it before the coffee gets cold. Stand it on the note on the bench, not balanced on the rim. A tapered tumbler or a flared fountain cup lies about its true size — the bottom is the only measurement that counts.
  3. Read the note. Base sits inside the square? It fits. Hangs over the edge? Too wide. A tiny puck lost in the middle — under 2 inches? Too narrow.

No calipers, no spec sheet, no guessing between jobs. One sticky note off the pad on the bench, one glance, with the cup you actually bring into the bay.

Fits — settles right in

Base 2 to 3 inches. Verified against manufacturer and retailer specs.

Red Bull 8.4 oz can2.08"
Simple Modern Trek 40 oz Tumbler2.14"
Alani Nu 12 oz slim can2.25"
Celsius 12 oz slim can2.25"
slim 12 oz seltzer can (White Claw style)2.26"
16 oz pint glass (standard mixing glass)2.38"
standard 12 oz beer longneck bottle2.41"
Monster Energy 16 oz can2.60"
Red Bull 16 oz can2.60"
Red Bull 12 oz can2.60"
Liquid Death 16.9 oz tallboy can2.60"
La Croix 12 oz can2.60"
Arizona 23 oz tall can2.60"
Topo Chico 12 oz glass bottle2.60"
Bang Energy 16 oz can2.60"
standard 12 oz aluminum can2.60"
Starbucks bottled Frappuccino 13.7 oz2.61"
Yeti Rambler 20 oz Tumbler2.75"
Yeti Rambler 30 oz Tumbler2.75"
Coke 20 oz plastic bottle2.86"
vitaminwater 20 oz bottle2.88"
Stanley 40 oz H2.0 FlowState Quencher Tumbler3.10"

Snug — the fins flex

Just over 3 inches. The flexible fins spread and these seat with a push — calibrated to 3.15 inches by the maker.

Owala FreeSip 24 oz3.12"
Stanley 30 oz H2.0 FlowState Quencher3.15"

Honestly, no

Bases over 3.15 inches don't seat. We'd rather tell you here than in a return.

Stanley IceFlow 30 oz Flip Straw Tumbler3.20"
CamelBak Chute Mag 32 oz3.31"
Yeti Rambler 26 oz Bottle3.38"
Ball regular-mouth Mason jar (16 oz)3.38"
Owala FreeSip 32 oz3.43"
Gatorade 28 oz squeeze bottle3.45"
Nalgene 32 oz Wide Mouth3.50"
Hydro Flask 32 oz Wide Mouth3.58"

The handle rule

Classic handled coffee mugs don't fit at any base size — the handle sits exactly where a fin needs to grip. Handle-less mugs and camp cups inside the range are fine. (Tall tumblers with high handles, like the Stanley Quencher, are fine too — their handles sit far above the fins.) Espresso cups sit under the 2-inch floor: too loose.

Where these numbers come from

One rule covers the whole list: a container base 2 to 3 inches across settles in. Everything below follows from it.

Build your set →

You'll finish at steadilabs.com — Steadi Labs is the manufacturer.