Backpack clips could be attached to certain backpacks, used to hold one of any item and would appear on the character. For example, I could carry a car tires by attaching the clip to my bag and putting the tire on the clip. This would result in the ability to carry the tire without using my hands and it would appear next to my backpack.
Description: A strap and clip that attaches to backpacks allowing one of any item (excluding rifles, backpacks, and clothing) to be carried.
Here's a list I made that shows what backpacks can carry clips.
SPOSN Tortilla Backpack: One clip
Hunting backpack: One clip
Drybag: One clip
Mountain backpack: Two clips
All bags not listed cannot hold a clip.
I hope this appeals to you and please tell me if you like this and what you would change if anything.