You can carry it on your back or attach it to your carry cart (trolley cart). It can be used for a wide range of purposes, so it is great for travel, sports, business, tours, and more! The bottom of the bag comes with a removable foam plate to cushion the impact when placed down. The opening is a roll-down type with a double structure. The inside of the top lid is equipped with a clear pocket that makes it easy to see what's inside. Removable backpack strap.