Astor's Pocket Cache

You bind a small extradimensional space to the playing card used to cast this spell. The cache can hold up to 5 cubic feet of nonliving material, not exceeding 100 pounds. When you cast this spell, and as a Magic action while the spell lasts, you can cause the playing card to unfold into a shimmering portal large enough for a Medium creature to reach one hand through. The portal remains open until you use a Magic action to close it, until the spell ends, or until you cast this spell again. While the portal is open, you can deposit or withdraw items, provided the total contents of the cache do not exceed its capacity or exceed the portal's dimensions. Only you can open the portal and access the cache. While the spell lasts, the back of the playing card displays an arcane images that represent the contents stored within.

When the spell ends, or if you cast this spell again, all items stored in the previous cache harmlessly appear in the nearest unoccupied space within 5 feet of you.