The Stow 500 ml collapsible water bottle developed by the brand HydraPak is a durable water bottle thanks to its flexibility. A spill-proof nozzle allows for easy drinking in less-than-comfortable conditions. The HydraPak 500 ml collapsible water bottle enhances your trail running, trekking, or climbing sessions, with its scoop handle for comfortable carrying and its weight being 80% lighter than most rigid water bottles.