The Nimbus Trace Access 70 is the pinnacle of Granite Gear's award winning Nimbus pack series. Big enough for longer, unsupported trips, yet lightweight, durable and functional. It features a zip open access panel and internal compression straps so you can get to that elusive piece of gear at the bottom of the pack without disturbing the gear above it.The backbone of the pack is Granite Gear's redesigned, three dimensionally molded Nimbus framesheet. Now made with a maple-core, composite laminate which is both lighter and offers more longitudinal rigidity. This combined with a newly designed exoskeleton belt combine to offer excellent comfort and load transfer to your hips. Material: Nylon.