Just seen this on their website, coming soon: http://www.gardinerpolesystems.co.uk/acatalog/info_BACKPACK.html Would be good for someone to review once they have one. I can only see 2 things wrong with it: 1- You can't see the fill level from the outside (same as WCW one) 2- the controls are on the back. OK if on a trolley or whatever, but if it's on your back (it is a backpack!) then the controls are difficult if not impossible to use. On the side like the WCW is the ideal place. Look forward to hearing more about it.