Your container has to have a name or number
This is so you can find it later! Every container needs to be numbered or named. If it's a box, write the box number on multiple sides of the box and the top with a permanent marker. If it's something you don't want to write on, put some blue painters tape on it and write on that, or use a labelmaker. If it's something you can't label at all, describe the container well enough to find it: "the red kayak" or "the bottom shelf."