Fits and protects the unit really well. This carry case uses a few Velcro strips to close the front flap. There are some gaps where snow and water can get in. If it’s snowing or raining while you are using it, the flap is wide open and your unit is exposed to the weather. The case works good for protection during transport but doesn’t really provide much while you are using it. I would recommend spending a few extra bucks to get the one with the zipper and clear window. The zipper keeps snow and water out and the clear window allows you to see the screen while it’s zipped up so you can protect your unit if it’s snowing or raining. It fits a FLX-12 Genz pack just fine.