When the weather turns wet its important to know that your equipment will stay dry osprey39s pack liners are designed to do just that to seal the contents of your pack against the rain and mud equipped with a fully waterproof roll top closure coated fabric and taped seams osprey39s pack liners ensure that all of your gear stays dry no matter what the conditions they feature a rectangular shape which results in more efficient packing when removed from your backpack theyre able to