Amazon.com: 20L Ultra Lightweight Foldable Backpack Small 。? HOT ITEM ? ?Lightweight And Waterproof: Weighing only 350g—lighter than a water bottle!Upgraded waterproof fabric and Special dome flap prevents water from entering the zipperkeep your belongings dry, rain or shine. Adjustable buckle to firmly stabilize the trekking pole. Perfect for hiking, traveling, or everyday use. ?DURABLE AND TEAR-RESISTANT：Seektop 20L Hiking Backpack is made from strong nylon 400D—resists scratches from rocks, branches, and sharp objects. Reinforced stitching + smooth metal zippers for long-lasting use. ?Foldable Design: unfolded size 20.5*13.5*7.5 in, folded size 9*8.5in. After folding, it meets the size requirements of most airlines. You can fold this backpack when not in use to save space. ?Smart Organization - Wet And Dry Separation: 8 pockets (5 of which are zippered) provide convenient organization. 20 liters capacity if you used wisely, you can fit up to 22 liters of gear. Velcro inside the main compartment secures the hydration liner, and a hose connection on the top of the pack makes it easy to assemble a hydration system. A dedicated waterproof pocket is perfect for wet clothes/swimsuits.Side mesh pockets hold water bottles/umbrellas. ?Carry With Comfort: padded shoulder straps to reduce pressure, breathable shoulder straps (no sweat!) and adjustable chest strap for a snug fit. Unique reflective logo and built-in emergency whistle for safety. ?All-Scenario Versatility: Designed for hiking, outdoor adventures, sports, travel,