The Spinner 2 Pro's front pouch is theoretically detachable, though you wouldn't want to have to do it in a hurry, and the fact that it's not securely stitched onto the rest of the bag means that if used as intended (ie. stuffed with tools and snacks) it rattles around rather disconcertingly on the back of the pack.
Two diagonal zip pockets run the full length of the bag and take care of bladder and kit storage, with a bungee and extra pockets to top things off. The harness could be softer but it did a reasonable job of holding things together.