I purchased this in 2022, but I haven't had many opportunities to use it. Distinctive features such as the zipper that allows quick access to the main compartment from the back and the chest strap components on the shoulder straps are concealed by a fly. The side buckles, which can be a bit of a hassle when opening and closing the main zipper, add a dynamic element to the design, and the shortcut pocket on the back enhances the functionality. "ACTION BACK" refers to action pleats. The tucks in the front zipper pocket expand when you put items in them, increasing the capacity. On the other hand, the open pockets are designed to expand inward, so they don't interfere with each other.