Gary Fong’s Puffer is a great idea.

A greater idea is to convert it to a bouncer. Practically at no cost.

All you need is a small rectangle of cardboard (about 12 by 5 cm) and another of aluminium foil. Stick the aluminium foil on the cardboard, so it is more rigid. Put the support bracket of the puffer on the camera and place the cardboard in front of the flash, in the position you think it will work the best. Take note of the two points where the bracket touches the cardboard. Cut two 2 mm holes. Push the cardboard on the bracket, while keeping it at the angle you like. Done!!

The following shots show how it looks on my camera, and samples shots, comparing direct flash with the Puffer and my bouncer.

Note that this mod only makes the light of your flash go up. Then to bounce the flash you need something over the camera on which to bounce it . It will work fine in most indoor locations, not so much in rooms with high or dark ceilings (not to say outdoor).
Sometimes, depending on the location I need to compensate under-exposure putting +2/3ev on the flash.

The bouncer add-on is small and flat, and it does not take any additional space in the camera bag where I already store the Puffer.