	Name	Purchased for ($)	Link	Made In
	Hasle Outfitters	$8.00	Search on Amazon	China
The cheapest tumbler here, and the lid is the problem: it does not close, so there is nothing to seal. It made a serious mess when tipped on its side, and the lid broke apart when the tumbler hit concrete from 30 inches. It also rusted heavily in the corrosion soak. What it does well is stay upright, tipping at 20.9°, third best in the group, and it held a respectable 41.3°F in the cold test. It will take 20 oz, but only if you drink some before pressing the lid on.
	Juro	$9.00	Search on Amazon	China
A $9 tumbler with a genuinely sealed lid, and the seal earns its keep: 99.8°F on hot and 41.8°F on cold, both mid-pack rather than cheap. It is also stable at 20.6°. The lid is where it falls down. It pops off before the flip top opens, so it is a two-hand job, and at 4.78 lb it is the stiffest lid in the test by a wide margin. The lid cracked and the tumbler leaked in the drop test, and it oxidized about as badly as the Hasle.
	Murricon	$	Search on Amazon	China
Tall and narrow, with a small mouth, and that shape does exactly what physics predicts. It was second best on heat at 109.8°F and third best on cold at 39.5°F, and it holds a full 20 oz with room for the lid. The same shape makes it one of the easiest to knock over at 16.6°, and the slider is stiff at 2.7 lb. The lid came off and was badly damaged in the drop, but it showed no visible rust at all after the corrosion soak.
	Klean Kanteen	$	Search on Amazon	China
The lid does not create an airtight seal, and everything follows from that: the biggest spill in the tip-over test, 42.0°F on cold, and 94.0°F on hot, near the bottom on heat. The large three-inch opening is easy to fill and pour and the electropolished interior does not hold flavors, but the tumbler holds 20 oz only with the lid off. It tips at 19.1°, its lid came off undamaged in the drop, and only a couple of rust spots formed in the corrosion soak.
	RTIC	$19.00	Search on Amazon	China
The best-sealed tumbler in the group. Its press-on lid held everything in when tipped on its side and stayed leak-proof gently placed upside down, and the flip top opens with only 0.75 lb of force. Insulation is the trade-off — 42.5°F on cold and 98.3°F on hot are both below average — and its tapered base gives it up at 17.8°. The lid cracked badly in the 30-inch drop, and it rusted more than the Murricon or Klean Kanteen.
	Tervis Diamond Plate	$20.00	Search on Amazon	China
The most balanced tumbler here. Copper-lined 18/8 stainless, second best on cold at 40.6°F and right at 100.0°F on hot, stable at 20.0°, and the second lightest lid in the test at 0.5 lb. It was one of only two tumblers to come through the 30-inch drop with the lid still on, undamaged, and almost no water lost — the best possible durability rating. Two knocks: it comes up about half an ounce short of 20 oz, and it is more prone to corrosion than the best performers.
	Coleman	$	Search on Amazon	China
The weakest insulator in the group by a clear margin — 87.7°F on hot, about 22 degrees behind the Murricon, and 43.4°F on cold. The rounded bottom is the other issue: it looks well designed for stability but topples at 16.1°, the worst result here apart from the CamelBak. The slider takes about 1.0 lb, which is easy enough. In the drop the lid stayed on but shifted out of its seat and several ounces escaped, and it oxidized heavily in the corrosion soak.
	Arctic Tumblers	$22.00	Search on Amazon	China
One of only two tumblers that kept everything inside both on its side and upside down, and its flip top is easy to work at 1.22 lb. Thermally it is near the back: 43.5°F on cold and 96.0°F on hot. It tips at 18.8° thanks to a slightly rounded base. The flip top sprang open on impact in the drop test but the lid itself survived and most of the water stayed in. It corroded quite a bit, though not as badly as the two cheapest tumblers.
	Iron Flask	$23.00	Search on Amazon	China
The heat-retention winner at 115.8°F, six degrees clear of anything else, and the plastic lid is why: it seals and then overlaps the rim of the tumbler, so the coldest air never reaches the steel edge. It held everything in when tipped, and its screw lid came out of the 30-inch drop looking new — the best possible durability rating. Cold is only mid-pack at 42.6°F. The real catches are stability, at 16.4° with all that weight up top, and a flip top that needs 3.72 lb.
	MiiR	$23.00	Search on Amazon	China
The easiest lid in the test at 0.25 lb, and thermally better than average at 102.8°F hot and 41.8°F cold. Sealing is the weak point despite the claim: it spills when tipped over and leaks badly upside down, and it emptied almost completely when dropped, though the lid itself was undamaged. It tips at 17.7° and is pretty much maxed out at 20 oz. On the other hand it showed no visible rust whatsoever after the corrosion soak.
	CamelBak	$25.00	Search on Amazon	China
Second best on cold at 39.1°F and strong on hot at 106.2°F, and it swallowed a full 20 oz with room to spare for the lid. Everything else is a compromise. Even fully closed the lid has a vent hole that prevents a complete seal, so it spills on its side and face down. The heavy taper and silicone base mean it will not slide but it goes over at just 12.6°, the worst here, and the slider needs 3.87 lb. A few rust spots formed, better than average.
	Hydro Flask	$28.00	Search on Amazon	China
It claims to stop splashes rather than leaks, and it performs as advertised — a small amount escaped both tipped and face down. The rim is less protected from outside temperature than the CamelBak's, and it shows: 94.7°F on hot and 43.5°F on cold both sit at the back of the field. It tips at 19.2°, the slider takes 3.25 lb to break loose, and it runs out of room at around 19.5 oz. It also rusted heavily inside and out.
	Stanley	$30.00	Search on Amazon	China
The best all-around tumbler here. It won the cold test outright at 38.9°F, tied for third on hot at 106.7°F, held everything in when tipped and leaked only a trace upside down, stayed reasonably stable at 19.4°, and finished the corrosion soak with no visible rust inside or out. It also holds a genuine 20 oz with the lid installed. The one real drawback is the lid: 2.24 lb once unlocked, and unlocking it takes a second hand.
	YETI	$35.00	Search on Amazon	China
The most stable tumbler in the test at 21.1°, and the magslider is the easiest lid to work one-handed, taking under a pound to move. YETI is upfront that the magnetic lid is neither leak-proof nor spill-proof, and only a small amount escaped in testing. It is the heaviest tumbler here. Thermally it is respectable rather than special at 41.9°F cold and 98.8°F hot, it comes up about half an ounce short of 20 oz, and it showed some rusting on the outside.

Rank	Product	Result
1	Stanley	38.90
2	CamelBak	39.10
3	Murricon	39.50
4	Tervis Diamond Plate	40.60
5	Hasle Outfitters	41.30
6	Juro	41.80
7	MiiR	41.80
8	YETI	41.90
9	Klean Kanteen	42
10	RTIC	42.50
11	Iron Flask	42.60
12	Coleman	43.40
13	Arctic Tumblers	43.50
14	Hydro Flask	43.50

Rank	Product	Result
1	Iron Flask	115.80
2	Murricon	109.80
3	Stanley	106.70
4	CamelBak	106.20
5	MiiR	102.80
6	Tervis Diamond Plate	100
7	Juro	99.80
8	YETI	98.80
9	RTIC	98.30
10	Arctic Tumblers	96
11	Hydro Flask	94.70
12	Klean Kanteen	94
13	Coleman	87.70

Rank	Product	Result
1	YETI	21.10
2	Hasle Outfitters	20.90
3	Juro	20.60
4	Tervis Diamond Plate	20
5	Stanley	19.40
6	Hydro Flask	19.20
7	Klean Kanteen	19.10
8	Arctic Tumblers	18.80
9	RTIC	17.80
10	MiiR	17.70
11	Murricon	16.60
12	Iron Flask	16.40
13	Coleman	16.10
14	CamelBak	12.60

Rank	Product	Result
1	MiiR	0.25
2	Tervis Diamond Plate	0.50
3	RTIC	0.75
4	Coleman	1
5	Arctic Tumblers	1.22
6	Stanley	2.24
7	Murricon	2.70
8	Hydro Flask	3.25
9	Iron Flask	3.72
10	CamelBak	3.87
11	Juro	4.78

Best 20 oz Tumbler: 14 Tested for Heat, Cold, Spills, and Rust

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Cold Temperature Retention

Hot Temperature Retention

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Lid Opening Force

The Verdict

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Cold Temperature Retention

Hot Temperature Retention

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The Verdict