Ultra-sil pack liner opens wide for easy packing when its inside a pack Unique top closure: extra fabric at the top folds in and hook and loops in place, then rolls down, creating a more compact closed loop at the top Made of PU coated siliconised Cordura Non-wicking Hypalon roll-top closure with stiffener at the top for a better seal Fully seam sealed Uses low profile buckles and slippery finish for easy packing <50L packs