Sea to Summit Frontier UL Collapsible Cup (400 ml, silicone and nylon)

How much it adds to your pack for the amount it holds. 7: Better than most.

Sea to Summit's UK page gives 53 g (53.2 g in its listing) and 400 ml, which is 133 g per litre (band 5). Its US page prints both 400 ml and, in its feature list, "54 g, 355 ml" (152 g per litre, band 4). Where the brand's pages differ we band the figure that scores lower, so it is the 4 band (150-219 g/L). UKHillwalking weighed 53 g but says the practical maximum is about 300 ml, which would be 177 g per litre (band 4); we band the brand's figures.

How evenly it heats, whether food sticks or burns, cleaning, and the handles, lid, pouring and steadiness on a small stove. 8: Clearly better than most.

Three hands-on sources like it. UKHillwalking (4) calls it lighter and sturdier than the original and uses the cups for a morning brew. Australian Hiker (4) scores comfort 1.8 out of 2.5 (3.6 of 5), but says small hands need two to hold it. Paul Messner (4, bought it himself) finds it stiffer, steadier on its hard base and nicer to drink from than the older X-Mug, though not by a lot, and he can feel the heat through the thin silicone; his video is a first use. Scores 4, 4 and 4: average 4 out of 5, so 8 out of 10; it would still be 7 if his were scored 3.