Oversized to give you that extra wiggle room. The Piragis Pack Liner is 100% waterproof to protect your gear! The liner is bright orange in color to help you see what you are packing. To ensure it's watertight, it has a 3-roll enclosure on top. Made with the toughest PVC-free PU coated rip stop nylon, so it stays soft and supple even in cold weather. The seams aren't just taped, they are RF welded sealed, for maximum waterproof integrity. Oh and one more added bonus, it's Made in the U.S.A!