Does anyone know where you can purchase a good quality fishing net?

I don't fish, but I was thinking of having one for emergency use. I don't know what type of fish I'd encounter though. Is there a net that takes out everything (emergency use only)? In an emergency situation I wouldn't want to be picky.

The net is for a BOB so there are some weight restrictions. I.e. I'm not looking for a commercial sized fishing net. I've seen a few around but the net has holes of 1" square which would allow most of the fish I've seen to easily swim through.

In my minds eye I imagine a net 12'x10' that has holes the size of 3/8" square.

Any ideas?

-NIM