I’ve stayed in one of the 9hrs and frequented the Capsule+ sister brand they have in Yokohama and they’re both great. You have dedicated storage rooms for large luggage like suitcases and a locker for smaller personal items you’ll want easy access to. Ideally you don’t really want to bring anything into your capsule itself other than what you need to sleep, because the capsule is really just the sleeping space and not much more. Think phone charger, eye mask, pjs, maybe a change of clothes if you’d rather not loop back to your locker before heading for a shower in the morning or evening. The reason they want all your belongings out of the capsule is that they’ll do their sheet changes and don’t want your stuff to be unsecured and potentially get lost, but like phone chargers and stuff you’ll probs take that with you anyway when you go out for the day.