A lightweight and collapsible 500ml soft flask suitable for filling with water, electrolytes, energy gels or your own nutrition mix. Shrinking as you drink, it eliminates liquid sloshing around and stashes neatly in a running vest or belt pack, pocket or pouch. Compatible with Rab's Aeon, Aeon LT and Aeon Ultra backpacks for quick and easy access to hydration. Softflask