WJJ3
Well-known
There's a good idea. Do you know the model name for the insert you have? The one thing putting me off from the F2 is the relatively small amount of space in the padded insert.
The little insert that comes with the F2 is a head scratcher.
Here’s the one that really makes the bag shine:
http://ciesta.co.kr/ciesta9_com/product/Flexible_Partition_L.inc
Scroll to the bottom for pics of it in the bag. That it’s the large size. They have many online distributers.