Hello and welcome to The Acaeum.
This topic does come up quite a bit, as you can probably surmise. Here are a couple of threads that might provide some help:
Storage bags suggestionsQuestions about storageThere's a lot of information in these threads, but you can simply take a standard magazine storage bag and cut, adjust and tape it to do the job.
There have also been some discussions on specific storage containers that would work. Perhaps another member can provide a link to those posts.