THINK YOU THINK , A PACK OF MULTI-PURPOSE -- This is a collection of shoulder strap loss function and three use system,slight water resistent and wear-resistant fabric hiking backpack . Essential for savvy travel extreme outdoor sports such as climbing as well as hiking and so on. TAKE IT All WITH YOU -- Carries as a backpack , packs like a messenger , hands be a shoulder bag . Measures 21.7 x 12.6 x 7.9 inch /55 x 32 x 20cm(H x L x W) 4.5lb weight with 40 L capacity fits 15 inches laptop. 10 multiple pockets for organizing( 1 main zipped pocket, 3 front zipped pockets, 1 side mesh pocket, 2 small strap pockets and 3 pockets in the large front zip pocket ) STURDY DESIGN -- All-round reinforcement design for multiple reinforcement protection . Stainless steel bracelet for durable. Brand chest belt, fixed shoulder strap to prevent the bag fall. Super comfortable thickening shoulder strap which under the ergonomic design and reasonable balance weight, more appropriate shoulder . Thicker back for good resilience. SURPRISE PRODUCTION -- Designed with today\'s traveler in mind, adjustable waist belt rang 90 - 140 ( cm ) for more options. Metal zipper head with a lock for security. The shoulder strap will flexibly been hidden at back . Decorate by leather and Lou Ding. High strength aluminum alloy is applied to the detachable climb buckle . Fresions mountaineering backpack is three times the wear resistance of other pack . Featured professional Oxford cloth and polyester. NOTE -- The zipper of main compartment on the left of bag when it works as a backpack. The 40L capacity fits ordinary trip.