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I was a bit skeptical about the straw lid being truly leakproof, but after tossing it in my bag with a full load, not a single drop escaped. The double-wall insulation keeps my water cold for hours, even during a hot afternoon hike.

The double-wall insulation actually works—my water was still ice cold after a two-hour hike in the sun. The straw lid seals tight enough to toss in my gym bag without any leaks.

Left it in a hot car all afternoon and the water was still cold that evening, which honestly surprised me. The straw lid seals tight too, no leaks rolling around in my bag.