Mazzachusettswrote a review of GSI Outdoors Flask on March 31, 2015
Familiarity: I've put it through the wringer
Took this on most of my NH 4000 footer trips and usually use it for whiskey on multi-night trips in the summer when beer isn't an option. Also used it for water while snowboarding in either a large jacket pocket or a cheesy backpack. The concave bottle contours to your spine. I used this on a trip this summer for a sidepeak water bottle after we drank all the whiskey and lost it coming down Owls Head so I need a replacement. Lasted me about 3 years, definitely earned some scratches from tossing it to freinds on summits but it never broke or leaked. I also bring this on trips where there is only a little booze left and I don't feel like lugging a big glass bottle back. Works equally well for wine also or use it to mix powdered gatorade in if you use a water bladder. If you prefer ultralight weight this isn't for you but then again neither is whiskey or huge balls of steel.