We bought these two packs just a few years ago and have only taken them on about 2 big trips plus a handful of to the family weekend type trips. These came from REI and they have backpack straps, wheels and detachable day bags. Amazon has them for 380 each right now. {url removed} REI has them on clearance for 280 - {url removed} We'd like to get 200 each. Details of the packs from REI Features High-clearance HighRoad chassis is ready to roll almost anywhere, and where it can't go it only takes seconds to deploy a comfortable, padded harness to finish the journey Detachable, 16-liter daypack with a comfortable, ventilated back panel accompanies you from basecamp to explore the market, wander through the museum or hike the local trails Zippered top pocket provides easy access to toiletries and liquids Padded top and side handles provide comfortable carry Dual-tube extended handle for extra control of large loads on rough surfaces Large panel opening with lockable zipper pulls offers access the main compartment Removable shoulder harness; rear panel pocket; ID card window Quick-deploy rear panel shoulder harness and padded back panel create an easy, comfortable carry Detachable Meridian day pack has a ventilated, tensioned-mesh back panel, wide zip access to the main compartment, a padded 15 in. laptop sleeve and a zippered tablet sleeve Meridian day pack pockets include a heat-embossed scratch-free front panel zip stash pocket, twin mesh front panel pockets, an internal organizer panel and a zip pocket Best Use Travel Bag Style Backpack, Luggage Gear Capacity (L) 75 liters Gear Capacity (cu. in.) 4,577 cubic inches Number of Exterior Pockets 2 + main compartment Laptop Compartment Yes Fits Laptop Size (in.) 15 inches iPad / Tablet Compartment Yes Wheeled Yes Material(s) Ballistic nylon Dimensions 28 x 14 x 13 inches Removable Daypack Yes Removable Bag Dimensions 21 x 19 x 13 inches Weight 9 lbs. 4 oz. Gender Unisex