The Ultimate Direction Fastpack 15 - Striving to "under-promise and over-deliver," the Fastpack 15 actually holds over 20 liters! Prepared for any adventure you throw at it, the Fastpack 15 offers large front storage pockets for water, phone, maps, glasses or food. Customizable fit with sliding rail sternum straps. Designated no-bounce laptop pocket with cord storage securely inside. High-strength, durable Power Span Stretch Mesh allows you to see inside pocket to view contents. MonoRip Mesh is very strong, extremely breathable and hydrophobic. Secured volume: 15L / 915 cu. in. Unsecured volume: 6L / 366 cu. in. Total volume: 21L / 1281 cu. in. Weight: 17.5 oz. / 500 g. Dimensions: 18.5 in. x 10.2 in. x 7.5 in. / 47 cm. x 26 cm. x 19 cm. Sizing at chest (Unisex): S/M: 25 - 40 in. / 64 - 102 cm. M/L: 30 - 48 in. / 76 - 122 cm. Measure wearing the clothes you intend to wear. Note: A pack full of gear will fit smaller. Get outside and explore.