HydraPak UltraFlask IT 500ml - Insulated, Collapsible Soft Flask Water Bottle for Hydration Pack - (500 ml/16 oz), clear

These soft flasks keep fluids cold in 90+ degree F temps. The tall straw makes drinking without removing from a hydration vest a breeze. I haven't tried putting coffee in these yet, but I'm sure I will in the colder months.

Great bottle, the insulation works well for what it is.Only complaint is once you remove the mouth piece for cleaning it easily come off when running from the main tube.

I use it for snowboarding and am a fan

Overall I like this product. I took a chance and froze it (which you can do with their other bottles but I'm not sure if you can with this one, so do it at your own risk) and still had ice after running errands for 4-6 hours, which was good. It does sweat at the top where the insulation stops, but not enough to be a deal breaker. It also makes the water taste funny, but hopefully that will go away in time. (Edit: rinsing with hot water and then cold, plus a 2-3 hour soak with ~2 tbsp of vinegar in hot water helped reduce the taste significantly).I'd like if it was a bit bigger, and if there was a cover for the bite valve and maybe a carabiner/carry loop, but overall these are minor issues for me and I'm still happy to have an insulated collapsible bottle. It's much more convenient to carry than a rigid one.