PETZL - Bug Climbing Pack, 18L / 1098 Cubic Inches COMFORTABLE AND COMPACT: Compact, ergonomic shape for maximum mobility during climbing or everyday use. Compact shape is snug against the back. DURABLE AND ROOMY: 18 liter volume for transporting equipment. Bottom and sides lined with high-tenacity fabric for maximum durability. ADJUSTABLE FOR A CUSTOM FIT: Features an adjustable strap for attaching a rope to the top of the pack. Also features an adjustable sternal strap ensures the pack is stable when climbing. ACCESSORIZATION FOR MOUNTAIN ACTIVITIES FOR EVERYDAY USE: Features wide exterior pocket, interior compartment for hydration system or laptop, wallet pocket, topo pocket in back of pack, and foldaway waist belt AVAILABLE IN 2 COLORS: Gray and Orange