Although the latest FRS radios are quite small, the problem is that you still have to pull them out of a pocket to use them.  Until someone makes one that you can clip to your jacket lapel, this is going to be the best/easiest/most effective way to use your walkies.  This has a very aggressive metal clip - I partially unzip a chest pocket and clip there.  I was looking at some of the 3rd party ones, but settled on the Motorola - it's not much more ($20 shipped) and I know I can trust it.