Hello everyone. I went to see GOTG for the third time last night.
I tried to pay particular attention to Quill's bag. I didn't notice any partition to make two sections in the bag, only that it was one space with no other pockets that could be seen. There were no zippers, snaps or other closures, the flap is the primary means to keep the bag closed. The opening of the bag is hemmed in leather. For extra security I would suggest sewing magnetic strips of some kind within the leather hem to keep the bag closed along with what the long flap and buckles provide. Hopefully that's helpful.