I haven't found a mini tool with a 15mm box, so you may need to carry that seperate.
I carry the Park MTB3 even though the tire levers are suited for mtb tires and not road, thus I carry seperate tire irons along with a QuikStik. I also carry cheap folding pliers made by Eddie Baur(sp?) from Target.
Craftsman (Sears) makes a 15mm stubby box wrench that would fit in a saddle bag.