While it features our patent-pending expandable travel compartment, that's where the similarity with all previous Knack Packs ends. From its sleek, minimal styling to its entirely redesigned organization compartment, this new member of the Knack family stands on its own. Key Everyday Features: Easy-access, padded side-zip computer pocket for 15" laptops Spacious main compartment with organization pockets, fleece-lined tablet pocket and removable key leash Hidden, zip-away side water bottle pocket Zip tuck-away back storage pocket for shoulder straps Side handle for easy carry Black metal Knack logo hardware Key Travel Features: Separate, patent-pending, expandable packing compartment holds 2 to 3 changes of clothes Meets most popular carry-on requirements as well as fits under most seats Packing compartment with easy-access suitcase lid Hidden trolley sleeve slips over wheeled luggage handles Key Technical Features: Custom-developed, durable, water-resistant body fabric Molded, comfort-cool foam back panel YKK™ water-resistant zipper with custom-designed pullers KNACK Steel Blue Series 2 Medium Expandable Backpack