18650 Battery Holder for bikes

I think the quality of the inexpensive import bike lights off Ebay is great except for one serious oversight - the cheap nylon bags they provide to house the batteries! Mine inevitably tear after flopping around and being a nuisance their entire lives, and I wanted something better. This is still nylon, but I'd like to think I'm leveraging it better. ;) Plus, you can print it in ABS and it should still work just fine. This is not pictured but you can run a 1"x 12" velcro strap through the s