Something to consider if you 'need' a lot of retainers for storage space: they will keep your items even if you cancel the subscription to those retainers. So if you have "long-term storage" items you want to keep but rarely use, you can put them on your highest-numbered retainer(s), then reduce the amount of retainers you have, and let those ones expire. Then you just hire them again occasionally (ideally at the start of a billing month) when you need to access those items.