For smaller lenses I use cardboard mailing tube cut to length. give enough protection from the lenses rubbing against each other.
Most of my lenses use 52mm or smaller filters so a 2 1/2" tube is big enough.
Do you line it with something?
I do use a digital device in my photographic pursuits when necessary.
When someone rags on me for using film, I use a middle digit, upraised.