@ClosetCleanoutCrew asks
cards fall sideways in my storage box because it isn't full. Do I just add more cards?
Jeff answers
I'd use suitable dividers or supports so the cards stay upright without being squeezed. You don't need to purchase inventory to fix a storage problem. Check the box's dimensions and the thickness of your sleeved cards. Stable and easy to access is the goal.
— Jeff, infinitepulls.com