The source liquitainer 2l foldable bottle just stick this flexible foldable bottle in your pocket or jersey great alternative or backup to any backpacked hydration system also good to store hot soup sterilize water and deep freeze source liquitainer 2l foldable bottle features folds flat when empty and stands upright and stable when full triple layer taste free film resistant to extreme temperature from 20oc to 100oc bpa and phthalate free