These are items which end up in the Other tab of your bag. Most appear to be drops from pals in the wild and are used for quests. If it says "no" in the Sell column, it means you can't sell it to a vendor (doesn't even show up in the list).

Other Item Name Sell Source Quest
Bag Containing Spirits Nute ( Suna Valley) From Sokalaze in Suna Village.
Furry Fur no ANNISERO A Pattern of Woolen Cloth
Long Tail Hair 10 Sron Family
Tasty Looking Grass 5 TORIKERA
Water Container 5