"What Our Gearhead® Experts Are Saying:""The 45L is the largest in Patagonia's travel pack collection: big enough for a week on the road, and compact enough to clear most airline size limits without a second thought. The convertible backpack straps make the hike from the gate to the taxi feel less like a drag.""Why We Like ItThe Black Hole MLC 45L Pack is built from 100% recycled body fabric, lining, and webbing, with a 100% recycled TPU-film laminate that keeps contents protected without adding unnecessary weight. At 45 liters, it sits in a practical gap between most duffels and larger expedition bags, with a clamshell opening that makes packing and unpacking straightforward on the road. Convertible backpack straps stow cleanly when we're rolling through an airport and deploy quickly when we need our hands free."