Mountainsmith Day Backpack For hiking, urban touring or school, Mountainsmith's lumbar packs are designed to stash all of the bare essentials you can’t imagine leaving home without. Some features include: removable shoulder strap with a sliding pad, air mesh foam back panel, Delta Compression System load adjustment, 2 water bottle pockets that accommodate 32 oz. water bottles, and a tuck-away waistbelt. Strapette compatible. Made from 100% Recycled PET fabric. Volume: 854 cu. in. Dimensions: 13'' x 12'' x 8''. Wt: 1 lb. 7 oz.