My kids have Zak! Designs double walled stainless water bottles that work great. They have destroyed everything they've had prior to these. They are pretty dented after a year and most of the paint worn off put holding up. We live high up in the mountains and go up and down 2500 ft altitude just doing errands and almost every water bottle with an internal straw would leak from air pressure change, these do not. We have the kind with the straw and lid that closes and latches, push a button on the front and it pops open. They have a pretty convenient handle which is nice because I always end up carrying them when hiking.. We have tall ones that dont seem to be on Amazon anymore or their website, they can be top heavy anyway and fall over out of cup holders when full, but the shorter ones are still listed. Ours may have been $25? the shorter ones are less. May be worth giving them a try, cant say if they are BIFL as we've only had them for a year but the kids destroyed most other bottles in 6 to 8 months before these.