Dang it, I don't want to part with either. I will reluctantly do the trade though I think. I love contests as a mini game, and would miss not being able to keep a poffin supply to use to complete in contests, but the coin case is more practical because you can exchange the coins for TMs and Pokemon. Since poffins are gen 4 I almost didn't do the trade because I was worried that I wouldn't be able to evolve without the dry poffins in DPPt, but then I remembered that you can turn Feebas into Milotic without poffins in HGSS if you visit Daisy Oak, so I can get still get one in gen 4 that way.
Speaking of HGSS... give me your fashion case, and in exchange I give you this Apriblender. Deal?