Here's an old idea that needs to get reposted
I think it might be nice to have a satchel. This could be a new type of backpack that takes a hip slot instead of a back slot. In return it could allow you to hold multiple smaller items (possibly a 2x2?), but allow you to still have a large item on your back.
This could be good for light weight kit explorers. It would allow them to bring a few extra utilities while still being able to hold and easily access a large item such as a weapon or tool. The main advantage this may have over other backpacks is the weight, while having a lower storage capacity.
A few secondary suggestions:
It would be cool if you had the ability to open and close this satchel while it is on your waist. (with something like grip+trigger or a button press) This could keep you from taking something out of it by mistake while climbing, while also allowing you to secure, unsecure, and access the items with one hand.
Like specialized bags, I feel as though it would make sense for this to have some sort of weight reduction property for the items stored just to drive home why this bag would be used.
Feel free to make any additional suggestions below!