which inventory did you mean? is it you 'BAG' or your 'CHEST'?
BAG MANAGEMENT
MC have a total of 18 inventory slots, first 9 slots have keybinds (1-9).
I recommend you dedicated last 4 slots for these: Stone, Wood, Fiber, Branch.
You can dedicated one more slot for Arrow (if you use bow like me).
Early game until you can get Ruck, you can tame deer/cow/sheep(s) for additional 20 slots with only 2 party slots.
I recommend you have 40 slots for harvesting such as berry, hide, honey, herb, feather, amber, iron, soil, poop, worm, etc.
so you need at least leader lv 1 (party cap 4) (cost 5 skill points) to bring 2 deers/cows/sheeps.
You can also add 20 more slots for equipments (such as bed, furnace, iron workbench, club, fishing rod, bug net, repair tools, shield, etc) but you need lv 3 leader skill (costs 25 skill points) to get one more deer (what I always aim first when increasing skills).
Once you have access to Ruck in purple area, you should tame it. It has 40 slots for only 3 party cap.
So with leader lv 3 you could bring 2 Ruck for total of 80 slots.
Later, you could just trade the Rucks you catch (untamed) to Nanachi for Pockets to increase 1 inventory slots of any follower you want,
max is 50 slots per follower. Even rabbit or chicken could have 50 slots.
Alternatively, although I don't recommend it.
with lv 2 carry (costs only 15 skill points) you could get another 15 slots inside Large Native bodies for that equipments.
The down sides are you will lose 1 MC's slot to put the body,
you also need to drop the body to access the inventory,
and might forgot to pick it up, ended up losing your items when the body disappear (got too far, teleported, reload save game).
CHEST MANAGEMENT
Well.. I'm sucks at it too..
So I just put cloth storage in a bit diagonal vertical formation near the workbenches and put my crafting items there until I get more advance storage with more slots like spider storage.
I only put item in chest for cloths and items that I don't use or very rarely use for crafting such as shell etc.
