waste water containers in Scandinavia

Buddy

Here we are in beautiful Sweden, having a great time in Karlskrona, at the moment. 

We have had one problem since leaving home. All the scadi sites say that  only sealedwaste (grey) water containers are to be used. So much for our expensive wheeled tanks with a tube poking I

 

in. Not allowed. They have pouches with pipe attached. A great idea but sherd can we buy them in the UK?  

This holiday has been the easiest and best caravan holiday after 25 years of France etc. I recommend this area especially to beginners.