If GAME is too fragmented when entering one of the big islands (like Windfall, FF2, Outset, DRI...), there is a fadeout that reloads the ocean (the purpose of it being to defragment the internal GAME heap). By opening a bag right before a GAME fadeout, you can get the cursor in very strange positions in the menu. See Fadeouts on the Actor Unloading page for more information on what this fadeout is.
This glitch can be used to equip bag items even if you don't own the corresponding bag.
To do this, open the start menu right before the GAME fadeout and immediately open any bag. After the fadeout, open your menu. You can navigate the cursor OoB, but it can only ever go up, it cannot go down further. This means that to equip a spoils bag item, you should open the bait bag or the delivery bag. If you want to equip a bait bag item, you should open the delivery bag.
There is still a way to equip delivery bag or bait bag items without the delivery bag though. You can do this by putting the cursor on any bag's return icon before the GAME fadeout ends. This will put the cursor at location value 0xFF. From there, each time you press up, you can decrease the location value by 7 (since there are 7 items per row in the inventory screen). Thus, you can: