Knack Bags Expandable Backpack – Like New! Tried once but missed the return window. This is the Series 2 Medium in Berry Blue (a rich purple-blue). Perfect for travel, especially short work trips, with an expandable design that easily fits your essentials. Stylish, durable, and versatile! Specifics from the website: Padded side-zip computer pocket for 15.6" laptops Hidden, zip-away side water bottle pocket Zip tuck-away back storage pocket for shoulder straps Side handle for easy carry Removable, adjustable sternum strap Expandable packing compartment holds 2 to 3 changes of clothes with easy-access suitcase lid Meets most popular carry-on requirements Hidden trolley sleeve slips over wheeled luggage handles Custom-developed, durable, water-resistant body fabric Molded, comfort-cool foam back panel YKK™ water-resistant zipper with custom-designed pullers