Hydrapak Ultraflask+ Filter 500ml liners A lightweight nylon spike plug

A lightweight nylon spike plug keeps ice out of the shaft

Signature Blend of Merino Wool and Rayon from Bamboo

Yellow Colour

making long skin tracks feel easier than ever before

Hydrapak Ultraflask+ Filter 500ml liners A lightweight nylon spike plugVest compatible filtration. Lighten your load and drink right from the source. Hydrapak took their go to flask and added filtration to create a system that delivers hydration without contamination. The filter light and compact screws on top so you can drink right from the flask. Or if youre carrying more water use the system to fill a bottle or reservoir. Effectively removes common waterborne bacteria, such as E. coli (99. 999%) and parasitic cysts