2" webbing with plastic snap hooks and a pad that attaches with velcro straps. There are D-rings on each corner of the pack for a total of 4 to allow you to get creative with shoulder strap connection.
It has a good amount of foam padding down there to aid in comfort with a dash of item protection.
The backpack straps which allow the best mode of carry for long distances. The straps are connected to the bottom of the pack which then connect to lower D-rings with snap hooks.
Even a sternum strap is included. When the straps aren't needed the user just unhooks the snaps and then can tuck the straps into its own zippered pocket.
This makes the bottom nice and clean, great for air travel where a bunch of straps can result in a shredded bag.