All crafting materials, including things like gifts of exploration, unidentified dyes, doubloons, amalgamated gemstones, etc.
Boosters would be a plus to add to the material storage, as well as experience scrolls or writs, tomes of knowledge, and black lion chests.
Another idea would be holiday or event items such as Super Adventure box baubles, Mystical cogs, Tonics, festival tokens, etc.
And a side note: it would be great if things that I’ve purchased off the trade or earned like the guild kite, magic carpet, bouquet of roses, red lantern, selfless potion, hot air balloon souvenir, how to dance, Musical harp, flute, etc., were all accessible from the wardrobe or hero panel. I don’t use these often as they are usually in my bank. It would be nice to easily access them as you would an outfit.
Thanks for working to expand the material storage, that’s excellent news. Even just adding all the scribe crafting materials will be a huge help!