occ, gotta disagree with you on that one, darling, sorry....nalgenes are the way they are because they contain bisphenol A, one of the ingredients that the EU has banned in childrens toys, as well as san francisco's recent ordinance. drinking warm beverages is worse out of nalgenes or any plastic for that matter.... it wont KILL you per se, but if you drink out of a nalgene for years and years and expose yourself to lots of plastic products and have children, well...lets just say they've come out with some recent studies about babies genitals coming out small and messed up.... that said, take a metal water bottle camping, it will fit relatively well and shouldnt be such a big deal with your water pump.... or can the nalgene except for during special occassions like backpacking and you'll be fine