we can not add atm new backpacks/skins cuz there is no slots left :/ we need to get first new backpack slots.
Thank you for the feedback, instead of exchanging say the teddy ruck for a skinned purple haze alice as KurinShiku says additional backpack slots would be required to open up the capabilities to add more and more.... which would be awesome!
Personally I think that skinned rucks would be more popular than skinned guns/armour/helmets and as for skins not getting used like the purple haze custom.. I think that since the updated system enabling us to skin multiple items at once that people are actually using them!