Just treated myself to one of these - the rrp is around £50 but Boots sell them for £35, and currently have an offer on that which now makes them £31.50 (with that and the current points offer, a great price!)
Boots describe it as an:
innovative versatile changing bag that keeps all your child's stuff close at hand wherever you go, while keeping all your personal gear safe from wet and messy things.
With it groundbreaking strapping system the Skip Hop Changing Bag quickly and easily goes from your stroller to your shoulder.
Skip Hop Changing Bag Features:-
* Large room main compartment
* Adjustable & removable shoulder Straps
* Waterproof Changing Pads
* Dimnensions: H38*W38*D10 cm