MaxMiles High Capacity 6100 Cubic Inches 100L Internal Frame Backpack Camo Desert Army PCT Hiking Backpack With Aluminum Frame (Green Tactical) Original package and RainFly Included only from Nature-Green Store. If properly fitted, the pack will hug the small of the back, causing the pack to move well with the body. 6100 Cubic Inches 100 Liters Liquid Capacity! Size:34-15-15inch. 600D Tend seal up well making it less likely that things inside will get wet. Extremely adjustable, and very comfortable on long hikes if done properly The formfitting profile of an internal frame pack reduces the chance of snagging against rocks or branches and makes them ideal for climbing mountains. Internal frame packs are designed to be loaded with more weight between the small of the back to between the shoulders Great in hot weather, because the frame keeps the pack suspended away from your back, allowing lots of airflow between you and your pack