Summit Vattenflaska med sugrörslock

I've been leaving it in my car all day and the water is still icy cold when I get back to it. The straw lid clicks shut tight enough that I don't worry about it leaking in my bag, which is exactly what I needed for my commute.

Took this on a hike in 90-degree weather and the water was still cold hours later. The straw lid is totally leak-proof too, which saved my bag from getting soaked.

My water actually stayed ice-cold through a full afternoon of yard work on a 90-degree day, which honestly surprised me. The straw lid seals tight when I flip the nozzle closed, so I can toss it in my bag without worrying about leaks.