Philis Backpack The Philis Backpack is an expandable style constructed from water-repellent, recycled polyester canvas. It features an unlined main compartment with a zip and flap closure, a padded inside pocket, and adjustable shoulder straps. Specifications: One size: 50 x 33 x 13 cm / 19.7 x 13 x 5.1 inch 21.5 liters 100% recycled polyester Water-repellent Unlined Internal padded laptop pocket, max 15"" Adjustable shoulder straps Square Label