With a name like Mountain Biker Lumbar, its pretty obvious who this waist pack was designed for. It works great also for hiking, road biking, and pretty much any activity for which a lumbar pack would come in handy think your next vacation to Florida. The Mountain Biker Lumbar has a breathable foam backpanel to minimize the dreaded wet spot, a zippered front pocket in addition to the main compartment, and water bottle pockets on either side with elastic retainer loops. Compression straps abound to keep everything nice n taut. Little goodies like a key clip and daisy chain sure come in handy.