Most people don't realize that there are a lot of different backpack colors and styles even among backpacks of the same category. By giving them previews and unique names, people can better customize their favorite survivors. It would also open up new layers of trading opportunities between players, as we swap for different colors and styles.
I suggest keeping the backpacks in the Storage Locker the same as it is now. Just add a button that when pressed, opens up a grid showing all of the patterns for that backpack, with the ones you don't have dimmed. Players can then selected highlighted bags on the grid to pull out. Bonus points if each pattern has a small counter in the lower-right hand corner showing the number of each pack you have with that pattern. JIC you want to coordinate your friends and followers.