As with all sleeping bag liners

with a continuous lumbar-to-hipbelt wrap

Effective against bad taste

and Down Defender adds an extra measure of moisture management

Osprey 4 Season's Insulation Kit Size:2 Liter As with all sleeping bagKeep water flowing in cold winter months and cool in the heat of the summerthis four season insulated kit is ideal no matter the season. Featuring closed cell foam, a heat reflective coating, removable bite valve sleeve and easy carry attachment loops. Fits reservoirs up to 3 liters. *Compatible with Hydrapak reservoirs produced after 2013. Heat reflective, closed cell foam sleeve offers maximum insulation Tailored insulated reservoir sleeve with