I have the BK Rob Roy. It's like the ribbed but with three tassels and without the medallion. Good stuff. It fits everything that normally goes in the pockets of my pants (pocket knife, keys, coin purse, wallet, etc.) with room to spare. There isn't a draw string, but it doesn't seem to need one.

My complaints? Well the chain stinks and diggs into your hips, but if you buy a decent sporran strap you'll be fine. Also everything in the sporran winds up a jumble at the bottom, but that's kind of what you have to expect.