You shouldn't pack things you don't need.
Sally is going on vacation with her partner, and they are currently packing their bags.
Sally wants to make sure she takes everything she needs.
Sally makes an organized list of everything that they will need.
Sally packs as many things as she can into her bags.
Sally's partner finds the list very helpful as it reminds him to pack some things.
Sally's partner thinks she is taking too long and becomes annoyed with her.