Slim pickings on duffle bags over here in Australia, but GCCC are stocking the 2015 model of the GM Original Duffle.
I picked one up today to take to training and it is much larger than I had anticipated. It is only ever so slightly smaller than my GN Legend Bag and my Gabba (Club custom) bag which has surprised me.
I have 2 bats, pads, thighpad, 2 x gloves and helmet in there atm with plenty of room, plus I haven't even put anything in the top section. Within the bag there would easily be room for another 3 sets of gloves or all your clothes or you could use the top compartment for that. Pretty pleased and will be very handy as I will cycle to training now.