Additional Storage Besides your Bag

I know this is an old thread, but since all of your characters share the bank account, I created a second, completely different character for the sole purpose of storage(my main character is a Bosmer Nightblade in the Aldmeri Dominion and my second is a Breton Templar in the Daggerfall Covenant). I only "cook" when I do the writs so I deposit all of my provision materials in the bank and then have my second character withdraw them to free up the space. When I get a provisioning writ I research what ingredients I need and then make the switch. It's time consuming, what with the loading and all, but it's definitely worth it. I also deposit items like crafting motifs and recipes that I've already learned so that my second character can withdraw and learn from them and be prepared when I start their quest line.