Winning Adventure Outdoor 50L Backpack (INTERNAL FRAME) can be used for various outdoor activities such as backpacking, hiking, camping, trekking and etc. Internal frame backpacks are reasonably flexible and designed to keep the load close to your body. They have numerous support points along the shoulders and waist, offering a comfortable fit against the back. The rigid frame easily supports a heavy load but relies on fewer support points along the body. The slight nudge of an internal pack makes it easier to maintain balance on uneven terrain, but the pull of an external pack allows you to walk more naturally upright.