K-01 - Smallest case
I"ve been looking for a small case for my K-01 and picked up a Case Logic DCB-303 today:
It fits the K-01 with the 40mm and a handstrap perfectly. Like a glove.
The only issue are that it's a zipper (slow) and there are small pouches on the sides making it a bit wider than it needs to be. (the pouches are handy for batteries/cables )
$10 at amazon: