Outdoor Research Cargo Water Bottle Parka #3, Black, 1size

I use these when fat biking in ultras, often over 100 miles in length. A Thermos in one of these will last 24 hours at -40 temps!

This cover does hold up well for my Thermos 1L and other 1L bottle nicely. For other pictures, you will see my Thermos fit nicely inside the cover (though Thermos seems a bit higher than cover, but no problem of fitting inside)I did a small test by putting a normal plastic bottle with cool water (that I have put in the fridge for about a few hours), and left this bottle inside the cover for almost 6 hours. By the time I took the bottle out, the water inside still keep the coolness, and if you look closely at the pic you still can see some sweat outside of the bottle (this means water still cool). This surprise me a lot as I would not expect non insulated bottle to maintain the heat like this.I also can attch this to my backpack (as long as the backpack has something for the cover’s strap to hold on). The cover’s nylon strap with hook and loop is very strong. You can also attche this to your bike (with some additional strap)

Waist of money. Sorry