I have been looking for a lighter weight, wide mouth solution to sub for my Nalgenes or hydration bladder for my trips and was eating the last of some peanuts (Emerald Nuts brand) when I noticed that the bottle was a perfect size (wide mouth for the steripen, probably about 20 something ounces.. haven't measured it yet) and I promptly took of the label and took it backpacking last weekend. It could use something to create a better seal with the lid but unless there is a lot of pressure on it, there will be no major leaking. I was very happy when I realized this and decided I should share.