Well, yes, I said that you can keep going back to camps to swap items around. That helps some, but lets go with your list:

btw you need the pick in the mountains and mistlands: you can whack the side of the mountain to make a flat spot to regen stamina to keep climbing up and up and up.... forever.
The hoe is optional unless very new to swamp.

all that aside, you missed the core issue.
Lets say you DO have those 13 slots.
add them up as you take a walk and explore**:
mistlands: black marble, copper scrap, copper bar, iron scrap, bug caparace, bug meat, bunny skin, bunny meat, y-wood, soldier mandible, gjall bag, puff, blueshroom .. 13 stacks already, and that is without any blue jute, free minor potions, boss collectible, trophy, jelly, or anything else.
The gear is only part of the problem, even if you minimize it, the ML and some other areas drop so many different types of crap that you have to stop and haul it home every few steps.
The forest is like that too... red shroom, dwarf eye, rock, wood, bone, troll hide, coins, ruby, pearl, amber, necklace, barfberry, seed, resin, feathers, whatever else.

The key here is the ** explore part. If you are gathering rocks or wood, well yea, you are all set. Its going out into the wild and grabbing what you come across that is a huge aggravation. And if you cross a biome, its all over, time to go home and dump.

Could be just how I play.. I tend to find an unexplored part of my map and go there as my default activity most days.

I would take the cart, but it was deemed to be too OP for the ML, so they made the terrain cart resistant. Its really only useful in two biomes, and only marginally there.. meadows and plains. Which happen to have the least amount of extra junk to collect (no dungeons there).