The backpack colours should have more variety, so far only voters bp has a special colour among the others.

A unique backpack has a special ID that only certain lucky people can get, as bp ids only reset once every season. Example of a unique bp would be, bp id 1, coloured in full white or bp id 666 coloured in red gray and black.

For what bp ids will be unique, it can be meme numbers, perfect or special numbers like 1000 or 2022, or made completely random. Just to make bps more interesting to those that has progressed far into the game. Though this is only a small detail and only applicable for future seasons.