Jocktrap with built-in bulge?

Strange title, but I'm curious. I'd love a jockstrap style device with a bulge (made of foam, cotton, or whatever) built-in to it. I would be able to wear it comfortably under my boxers without worrying about it falling out, moving around, etc. It'd also probably be cheaper than a silicone packer. Yet I can't seem to find anything online. It seems like an obvious thing that should exist. I'd make one myself if I wasn't shit at sowing. If y'all have any links, I'd love them.