I recently purchased an Overboard mp3 wetpack for use as a replacement aquapac. At first I thought, although a tight fit it was pretty nifty. But being a tight fit it does'nt allow for any stretch or movement.
The obvious thing happened and it tore along the arm band sleeve allowing the ingress of water. It also comes apart at the opening where the plastic buckles fit to the polythene cover.
IMHO the pack is probably better suited to girl guides on jet skis, so they can blot out the sound of a screaming windsurfer vying for right of way.
I'll be buying a paqua midi. There is no such thing as a bargain, you get what you pay for.