Does any one know the internal dimensions of the Maxpedition Urban Wallet?

It’s not the 4.5 x 3 x 0.75 external dimensions that everyone and their dog claims is the ‘capacity’. Being in Australia, I can’t nick on down to the nearest retailer and check it out myself.

I’m looking for what size the inside of the gusseted area is, so I can workout what will fit in it without straining the sides.

Also, is there an alternative product out there with a similarly sized main carry pocket?