I have this flash bag currently cost me for 9.90 and after a quick delivery, I was finally able to see if my Nissin DI fits 622 Mark II. Yes! And a set of batteries in addition fits into the small front pocket. The neoprene material is also quite thick, so shocks are well cushioned and thus prevent damage. Furthermore, the neoprene material also provides a raincoat because it is waterproof even under a running water tap. (Self-tested. Of course, no flash inside, but my hand). Through a velcro the bag can be easily opened and closed. A robust plastic carabiner and belt loop on the back are also used for a solid connection.
In short, I did not expect more. Exactly what I wanted. A good protection for my Nissin DI 622 Mark II. 5 stars.