Here it is on the side of my Falcon II. It is constructed of 1000D Cordura nylon and is available in five different colorways - Black, Khaki, OD Green, Foliage Green and ACU. It is approximately 4 inches in diameter by 2 inches thick. There is a small slip pocket on the front. Being round, it works very well for things like headphones, phone chargers and other small coiled-up wires:
Inside, I have my iPhone charger/cable and headphones. (I use Skullcandy Smokin' Buds - they're a huge improvement over those awful things that come with the iPhone/iPod. I added a cordlock to the little bag they come in). The whole interior is lined with a soft fleece-like material which prevents scratching. Sewn to the inside back is an elastic strip that keeps the USB cable wound up.
It attaches to standard PALS webbing with a single 3" Malice Clip, TacTie or similar device. I suppose you could attach it to a belt using the same method, but the addition of a belt loop would have been nice.
Overall, I like the Tactical Can Case. It works well for the way I use it and it, like all of Maxpedition's products, is built to last.