Western Mountaineering Bag Accessories Stuff Sack Black Extra Small XS Stuffsack XSStuffsack. When stuffing alwayspush your sleeping bag to the very bottom of the sack. You may findthat our Gore Windstopper bags will stuff easier if they are turnedinside out. Use the stuff sack only when transporting your bag. Ourstorage bag is a large volume bag that allows your sleeping bag tobe stored fully lofted. This allows the down to breathe and stay lofty.Your sleeping bag should always be stored in this large bag. This isan important way to protect your investment and to prolong the lifeof your sleeping bag.