Fits like a glove
Since I started using a calcium reactor back in 2004, I've always had 5lb aluminum or steel cylinders, and I have to refill them a few times a year. For the most part, a local liquor store would refill empty bottles for a nominal amount. A couple of years ago, the owner got a tad picky about said bottles (from others) and demanded that every sticker be removed or they would refuse service. This included the brand of the cylinder, any logos, you name it.