Five tumblers stood out during our cold-retention Slurpee test, and an earlier incarnation of the Hydro Flask was in that top five. The Hydro Flask took second place in our heat-retention test, bested by a single degree in temperature, so it will easily keep your coffee hot for the duration of your commute. But the aesthetics were why people loved this tumbler. We chatted up a dozen (or more) people over dinner around a campfire, and they all agreed that the Hydro Flask was easier to hold and more visually pleasing than any of the other 16 models we looked at—and that really mattered to tumbler devotees. At the time, the Hydro Flask had the slimmest, most covetable shape of all the tumblers we looked at and came in eight pleasing powder coats. (We prefer those to plain stainless steel tumblers because those get uncomfortably hot to the touch if left in the sun.) Hydro Flask offers a lid with an integrated straw for its tumblers. We’ve tried that lid on the larger version, and it’s great: secure, easy to remove and clean, and fitted with a flexible silicone mouthpiece to prevent soft-palate jabbing. However, the new slider lid’s drink opening is large enough to accommodate a straw; the previous version’s was not.