IsherSelection High Quality Oxford Fabric Waterproof Travel Backpack Daypack Material:600D PVC nylon,durable,can carry heavy-duty. Size:S:(40L=Length:10.7''x Width:7.9''x Height:19.7'') M:(50L=Length:12.6''x Width:8.6''x Height:23.7'') L:(60L=Length:13.8''x Width:9.8''x Height:27.6'' ) XL:(70L=Length:16.1''x Width:9.8''x Height:29.5'') XXL:(100L=Length:14.6''x Width:12.6''x Height:34.3'') Features:Durable,waterproof,padded and adjustable shoulder straps;Reinforced drag handle;Heavy duty rust resistant nylon zippers.Breathable mesh backing provides a cool feel in hot weather.Thickened computer protective interlayer inside,extra compartment for accessories. Advantages:The outdoor backpack can be carried by a single shoulder,or by two shoulders, or by hand. It's concise designed for convenient and practical. The bag with large capacity,and has five size can be chosed,multiple application. Occasion:Hiking,climbing mountain,camping,cycling,various outdoor sports