Cupboards
Doors, shelves and the things inside
A tall cupboard uses height; a low unit leaves the wall above it free. Neither tells you how much usable shelf space you will get. Look for internal dimensions and check whether the shelves move.
List the largest things you need to store. Compare their height and depth with each shelf, and check the stated shelf load. If the listing gives only outer dimensions, ask for the inside measurements before ordering.
Measure the space