Eagle Creek Travel Gear Pack-It Medium Compression Sac Reduces volume up to 80% Patented one-way pressure valve Patented zip closure at top "I was able to pack 2 weeks worth of clothes into one roll aboard suitcase. It was great." -KM Traveler Reduces volume up to 80% Patented one-way pressure valve Patented zip closure at top "I was able to pack 2 weeks worth of clothes into one roll aboard suitcase. It was great." -KM Traveler