I have 3 of the guzzler bottles
I have 3 of the guzzler bottles. 2 950ml, and one 1.9L. I love both of the 950ml, they keep my water cold for the promised time, and they easily fit in my bag (I use one for work, and one for bed). I decided to order the 1.9L to use at home to keep track of my water intake. However, the 1.9 doesn't keep drinks cold for very long, maybe a few hours max. I'll put in cold water from the fridge first thing in the morning, but by late morning/lunchtime, it's more room temperature. Disappointed, but overall I do get good use out of the smaller ones.