here you are .....
Approx. pouch dimensions :
18cm x 12cm x 9 or 10cm

I'm considering another approch : transfering the contents of the blue box (hopefully rarely used PSK) in a neck pouch (something like that or perhaps a waterproof model ) ; this one I would keep it under my shirt, not visible.
Maybe a good winter idea ... but not so easy in summertime .... with light summer shirts ...


Alain