When the students come into the museum foyer, we ask them to check in their backpacks with their books, lunch boxes, etc, at the cloakroom before they enter the museum proper.
I was known mainly in school for having a backpack bigger than I was and always having white-out on my hands, because I hated seeing anything crossed out in my notebooks.
If you're going on a long vacation, I would just check an empty bag and I would buy clothes while I was there and put everything that I would absolutely need to wear in a carry-on backpack.
I didn't want to share these traditions that others would find strange, but as I sneakily took it out of my backpack, my friend turned to me excitedly and told me it was the prettiest thing they had ever seen.