A 20 oz tumbler usually measures about 3.5 inches wide and 6.6 to 6.9 inches tall, weighing near 0.9 lb empty, and YETI’s own spec sheet says the 20 oz Rambler fits in most cupholders.
Two tumblers holding the same 20 ounces can differ by nearly half an inch in height, so a cup that fits one cupholder can jam in another. The capacity number tells you nothing about whether it will stand upright in your car or clear your cabinet shelf.
What Are the Actual Dimensions of a 20 oz Tumbler?
A standard 20 oz YETI-style tumbler is roughly 3.5 inches in diameter and 6.6 to 6.9 inches tall, with an empty weight of about 0.9 lb.
YETI’s 20 oz Rambler page lists 3.5″ W x 6.6″ H (8.9 x 16.8 cm) and 0.90 lb empty. REI lists the same Rambler with MagSlider Lid at 6.9 x 3.5 x 3 inches and 12.7 ounces. YETI’s drinkware comparison page repeats 3.5″ width, 6.6″ height, 0.9 lbs.
Those gaps aren’t errors — retailers measure from different reference points, and some include the lid in height. For a tight space, cite the source you measured against rather than splitting the difference.
How Much Does a 20 oz Tumbler Weigh?
Expect about 12.7 ounces, or 0.90 lb, empty — light enough for one hand, heavy enough to feel solid when filled.
Stainless steel gets its insulation from a double wall, so a 20 oz tumbler weighs far more than a same-size plastic cup. REI lists this Rambler as 18/8 stainless steel and BPA free. Add 20 ounces of water (about 1.25 lb) and the total lands near 2.2 lb — the number your wrist and bag carry. Weight on a cupholder base is why a heavy tumbler can tip on a rough road even when the diameter fits.
Will a 20 oz Tumbler Fit in Your Cupholder?
YETI states the 20 oz Rambler “should fit in most cupholders” — but “most” is not “all.” The deciding measurement is width, not height: YETI and REI both list 3.5 inches wide (REI adds 3 inches depth). Vehicle cupholders vary in diameter and shape, so compare your cupholder’s opening against that 3.5-inch lip.
- Tapered or slotted cupholders — common in newer cars and wider at the top, so a 3.5-inch base usually seats fine.
- Deep narrow cupholders — risky; a taller 6.9-inch body can lean or catch if the well is shallow.
- Stroller and office-chair cupholders — usually smaller in diameter than car wells and most likely to refuse a full-size tumbler.
Measure your cupholder’s inner diameter before buying. Anything at or above 3.6 inches clears the tumbler with room to spare.
Once the dimensions check out, our guide to the best 20 oz stainless steel tumbler compares tested picks by fit and insulation.
Why the Same 20 oz Tumbler Measures Differently Everywhere
“20 oz” describes capacity, never physical size, and each retailer measures the body its own way — YETI’s 6.6-inch height and REI’s 6.9-inch overall height describe the same tumbler measured to different endpoints. Two mistakes trip people up: treating 20 ounces as a size (it’s volume, and says nothing about height, diameter, or cupholder fit), and trusting one number from one page.
| Spec | YETI Listing | REI Listing |
|---|---|---|
| Width | 3.5 in | 3.5 in |
| Height | 6.6 in | 6.9 in |
| Empty weight | 0.90 lb | 12.7 oz |
| Capacity | 20 fl oz | 20 fl oz |
| Cupholder claim | “Most cupholders” | Not stated |
| Material | Stainless steel | 18/8 stainless steel, BPA free |
| Depth | Not listed | 3 in |
YETI’s product page carries the full spec set for the Rambler 20 oz Tumbler with MagSlider Lid, and YETI’s drinkware comparison page lists the same width and height beside every Rambler size.
FAQs
Is 20 oz a good size for a travel tumbler?
It hits a useful middle ground: a large coffee or a can of soda with ice, under seven inches tall, clearing most cabinets and cupholders. A 30 oz version holds more but grows taller and wider.
Do all 20 oz tumblers fit standard car cupholders?
No. YETI describes the 20 oz Rambler as fitting most cupholders, not every one. Check the 3.5-inch width against your cupholder’s inner diameter. Deep, narrow, or non-round wells are most likely to reject it.
Does the lid add to the tumbler’s height?
Sometimes — that explains the gap. YETI lists 6.6 inches, REI lists 6.9 inches for the same tumbler with its MagSlider Lid. For a tight shelf or drawer, assume the taller figure.
References & Sources
- YETI. “Rambler 20 oz Tumbler with MagSlider Lid.” Source for 3.5″ W x 6.6″ H dimensions, 0.90 lb empty weight, and the “most cupholders” fit language.
- REI. “YETI Rambler Tumbler with MagSlider Lid – 20 fl. oz.” Source for 6.9 x 3.5 x 3 inch dimensions, 12.7 oz weight, 18/8 stainless steel, and BPA-free listing.
- YETI. “Compare Drinkware.” Source for the 3.5″ width, 6.6″ height, and 0.9 lb weight across Rambler sizes.
