I love my Storacell battery holders, great for general storage and travel. But they don't make anything for 16650/17650/17670 size batteries. I'm not interested in converting everything to 18650s, I don't want to replace my Surefire bodies. Can anyone recommend a good case/pouch/holder for these sizes? Something relatively protective, enough to be able to throw 3-4 batteries into a carry-on or backpack.