Maybe you are doing something bad
You might be doing something wrong I played d2 for over 10 years and played for about 10 hours a day, and never had a problem regarding space, as i mentioned earlier.
Perhaps you should consider not keep things that aren't worth keeping and use one mule to store gems/skulls instead of four.
Use your runes to equip your characters rather than stocking 50 El Runes plus 150 runes from the eld.
If you use one mule for the ring and amulet, you do not need two.
Do not use two mules to tradeable and craft jewels. make use of the pgems mule to get the jewel do not delay until you have 5845604515 PGEMS to use them prior to.
Use one only for rare and rare items Use the same Mule for both.
There are no set items that can be traded that can be worth making an mule special for , so make use of the same "trade mules" for all trades and trade more frequently instead of every seven years.
Runewords rolled... my mew... My runewords that I rolled are mine to sale or use, not to saving them for the mule.
One for torch? You can use any of the mules to do that. It's only two slots.
1for keys, totally agree that you should also get one set of keys and acquire organs, and then have an organ mule (triple space = three mules)
1 for crafting materials... Well... it's a good idea to are able to optimize this more than having a mule filled with hundreds of bad-crafted objects.
I've played d2 and already knew your are not optimized and prepared You just create each character one after the other and save everything you create even though the vast majority of them are beneficial at the beginning of each ladder.
To sumarize it.
1 mule to make pgems and jewels to create your craft or to sell them at forty in 40 (that is, in this case, they are sold when you've got 40-80 but not until there are 4000000).
1 mule, with 2 low runes and a selection of the most frequently used socketed items
1 mule to carry keys or organs (you could make use of the smither as an Uber killer character)
2 mules for self-use items, crafts, rolled runewords and so on...
2 mules to trade (and I'm giving it to you because when you require 2 mules you're selling items that are in a bad way or selling items that are useless In fact, you should make a sale of your items within your farm's mf character while you're doing your Mf runs)
1 mule to make a ring/amulets plus several other items that are socked (monarch/hoto base/enigma base and the rest are simple to locate while playing a little following the initial day of the ladder)
If you don't have a mule to torch, then utilize your mules as a mule and then sell them before you farming more.
It's 8 mules. you could be six mules if you make use of the smither as a mule, and using the MF character as seller.
The only thing you're lacking is preparation Don't show up here thinking you're an expert on the d2 program when you're even a novice judging from the content you've written there. And how to get d2r items, d2r ladder items safe? Go to P2Pah buy & sell, have a great service.