【Shipping operations will be unavailable in March, so we plan to take the listing down around the evening of February 27th. We plan to relist at the beginning of April. Also, we are open to price negotiations, as long as the discount isn't extremely drastic.】 The back is H-shaped, which helps prevent the shoulder straps from slipping, and the length of the shoulder straps can be adjusted in two stages. Also, the back is secured with buttons. There are large pockets on both sides. Product number: 34542-27000 L size Black