Plan for the end product, not the intermediate product, and gather accordingly. Work in smaller batches and use the intermediate supplies you have before you make more and your inventory will not fill up with too much stuff.
The only way for that is to give player more storage space that is not on their character.
And I got a new wrinkle for you...breakable tools...Everyone...yes everyone...has at least 3 or more of the same tool in case the one they use breaks.I myself carry at least 5 mining picks in my inventory. Each pick takes up 8 inventory spaces. Broke 6 one time in one session. It is time consuming to run out of the tool and have to fight your way back to get replacements. This basically ends the night for someone with limited time.
I thought the bank only had 20 items? when did it go up to 36? And I know what you were talking about. But thanks for clarifying it.