This is a follow on to the Backpack alternative. I know that the more you spend on this , the more you have to start looking a just buying a Backpack, but, if your like me and love messing around getting creative, then its worth it. So I decided to buy this for £15.99 to play around with. http://www.ebay.co.uk/itm/131108135523?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 I like this big 20L design with the handle NOT on the lid. Now I made this without documenting how I did it as I went along so heres the pics explaining for those interested. Using the box made in this thread http://windowcleaningforums.co.uk/threads/homemade-alternative-to-backpack.11995/ So that box with this Backpack come to around £55 drill a hole into the metal pipe and thread microbore through. Cut inlet thread at the top, widen the hole and thread microbore pipe down through the casing to the bottom of the container. Discard outer casing of the down pipe and cut the end off the inner casing to get microbore through Cut slots out of the sprayer base with a Stanley knife so it fits around the pup box and put 'stops in the screw holes in the box so the sprayer doesn't slide around any Clip the pole hose through th gap in the lid and just loop any excess around the top. That's about it. I like the fact that the feed into the sprayer is separate to the water filling part so the pipe can stay in at all times when refilling. It is also comfortable to carry due to the shape.