The Mystery Ranch Pop Up 18 Backpack is a heavy-duty bag that's perfect for any hunter expecting to haul back a week's worth of dinner. These Backpacking Packs by Mystery Ranch contain an external pop-up frame that pops into place to support the heavy hauling of goods. However, this frame will collapse back into the packs' back panel when not in use. The OVERLOAD feature of the Mystery Ranch Pop Up Hunting Daypack is perfect for those looking for extra comfort while carrying heavy weight. This feature works by providing functional expandability via a load sling between the pack and the frame of the bag. Spare your back the pain during a long haul and grab the Mystery Ranch Pop Up Convertible Backpack for your daytrips and hunts to stow the most meat with the least amount of effort.