The Softflask 500 is a highly compressible 500ml bottle with a bite valve and locking system. No wonder it's an award winning Hydropak softflask - clean, compact and comfortable to use.
Hydrapak says:
Take matters into your own hands with the SF500 Handheld SoftFlask. Designed for the minimalist runner, the SF500 is easy to hold with a flexible hand strap. It has a leakproof auto-shut off valve, twist locking cap, high-flow bite valve and a 42mm opening, so it’s easy to fill. Your next PR awaits.
The Hydrapak Softflask 500 not only collapses for storage, it actually collapses as you drink, preventing that annoying sloshing when your on the move.
What makes this softflask stand out from the others is that it features a spill proof, self sealing bit valve with an extra locking cap to prevent any leaking in your pack.