and kits
Build a pack out of what you already own.
Items are assigned to containers and to people, so a group trip shows who carries what. The inventory knows what each item weighs, so every loadout totals itself as you build it — worn, carried and consumable counted separately.
The same 340 g stove sits in six loadouts. Edit it once; every total updates.
An inventory that size needs a way in. A shelf is a view you save over it — the grouping, the columns and the filters that turn "trail gear" or "to buy" into a place you go rather than a set of filters you reapply. Pin the shelves, loadouts and kits you use to the sidebar, in folders once there are enough of them.