Our take This 17-ounce, soft-sided bottle marries insulation and packability to help your cold bevvies endure long hikes. Closed-foam insulation does the temperature regulation, which held ice cubes
for 2.5 hours on hikes in Utah’s Wasatch Range and Rocky Mountain National Park (versus about four hours for hard-sided insulated bottles).
A few key details make it trail-friendly: A wide mouth fits ice cubes and the bite valve seals itself after each drink. Another shut-off valve on the cap eliminates spills, and testers reported zero leaks, even when the bottle was under compression straps. The textured polyurethane material keeps the Chill Flask from slipping out of sweaty hands. Bonus: Unlike all hard-sided insulated bottles, this one is dishwasher safe.
Trail cred “It fits great in your pocket and the insulation keeps the water from warming up due to your body heat,” says one tester.