guide for leaving stuff somewhere:
unless the stuff is big (like a bike) (or alive like a plant) put it in a heavy-duty bin/box/tote/crate. If you can't afford a heavy-duty container to put the stuff in it's probably not stuff worth holding onto and it would be better to get rid of it.
if the stuff is going into a basement or somewhere that could be damp, throw in a couple desiccant pouches into the bin.
if you still care about the stuff in 6 months, check in on it.
if the stuff is alive, like a plant, check in on it every ~2 weeks.