A little know-how
01Stow, UltraFlask or SkyFlask?
Start with how you want to carry it. A compact bottle, vest flask and handheld flask have different shapes and access. Check pocket dimensions, cap clearance and whether the flask stays secure when partly empty.
02Match a reservoir to the pack
Compare the filled dimensions, hanging system and hose routing of the exact Velocity model with your pack. Reservoir capacity and overall pack capacity are separate measurements. Make sure the hose reaches comfortably without catching on equipment.
03Care and compatibility
Follow HydraPak’s cleaning and drying instructions for the specific product. Caps, hoses and filters are not universally interchangeable. Carry safe drinking water; a flask or reservoir alone does not treat untreated water.
For current model details, care instructions and manufacturer guidance:
HydraPak product and care information





