1. Tools that I don't use, wetsuits, perfect fruit and some piece of furniture to give to villager. Put the crowns and bow wig for safekeeping.
2. RV items that I still need to decide where they go. Not sure why I bought items from the amiibo RV when I could have waited until I needed them.
3. Fish, diving, fruit and mushrooms for harvest day.
4. Fish/bugs for request and for premium days. Waiting to sell the Tuna at premium.
For my spare players most of their items went into the secret closet. Locker has a lot of free space for holding turnips or perfect fruit to sell in other towns.