Has any one tried using an FFG dice bag as the monster cup?

Is it big enough?

I don't use an FFG one, but I use Dice Bags as not only my monster cup, but also as storage for all the helath chips/elder signs/ect. You need to buy bigger Dice Bags for the Monster Cup, but it works servicebly.

The FFG bags are nice and big and work perfectly - I use the one with tentacles for Mythos monsters!

I found that the dice bags work great for monster bags in both the Elder Sign game as well as Arkham Horror.

I use the bag given out at last years Arkham Nights event for my monster draw bag with the Elder Sign game.

It seems quite appropriate...

There is a big problem with using a bag for monster picking though. The thing is everyone tends to "shake" the bag quite often, thus exposing the monster markers to a great deal of wear. It is useful, but your monster tokens will wear very rapidly if not used with extreme care.