Very easy to put anywhere in a pack, but this thing does have some quirks. It will not stand up by itself unless you balance it, and it will most likely flop out of any cup holder or backpack pocket. I do not mind that much but something to be kept in mind. As far as leakproof goes mine was for about 5 months but developed a pin size hole on the top after normal use. Hopefully I can warranty a new one with the company.
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