They come in three sizes and I picked up the small and medium variety. I had checked the dementions at the store and found that my 8400 Zippy would fit in the small one and my KX3 into the medium. When I got home I found that they were an excellent fit.
The battery as you can see is a perfect fit. It is exactly the type of protection I was looking for. The KX3 below was also a great fit. Inside the case is a rubber floor that is removable. I found that I could store some items under it. The only thing I cant fit is the cheap set of Sony headphones I use.
As you can see both cases fit in the radio pouch for my pack. I like the idea of the added protection for my KX3. Again I am trading a little bit of weight for a lot more protection. I think it is worthwhile tradeoff.
I also added some sheepskin seat-belt covers to my rucksack straps. I found these some time ago and finally got around to mounting them. They are verrryyyyy comfy.