The Eagle Creek Pack-It Compression Sacs Set M/L is a 2-in-1 set perfect for travel or storage. Made from polyethelene, the Compression Sacs are strong, water proof, and rip-stop nylon reinforced to protect against tears. This Eagle Creek Pack-It Accessory features a patented one-way pressure valve to remove excess air from bulky garments and seals up tight with the patented zippered closure at top. Using the Pack-It Compression Sacs for a pillow, jacket, or your favorite sweater, you can save up to 80% of its packing volume. Great for dirty laundry, you can seal them up in an airtight sac to keep your dirty clothes from the clean. The Eagle Creek Pack-It Compression Sacs Set M/L lets you pack everything, no matter how bulky.