Looking at the photo, I'm inclined to think that that is one of those sporrans that's meant to have a stiff face and back and the only part that has flexibility is the gusset. If you want to stuff everything into a sporran, you have to look at the "Rob Roy" type which is more of a soft leather pouch that can open up and accommodate all your stuff.

One of our kilted brethren recently posted a shot of a "Rob Roy" type sporran that he was making wherein he managed to get the entire pouch section over his entire head...looked like some kind of a Viking football helmet but it proved that the sporran was capacious.

Check out our sponsoring vendors for that type of sporran...look at Turp's Thorfinn Sporrans for an example of what I'm talking about.

http://www.thorfinnsporrans.com/3.html

Other than that, you might consider getting an auxiliary belt pouch to hold the overflow.


Best

AA