Bought this trailer to carry our 12 year old spaniel, who can no longer run with us as we cycle. It's very well thought out (copy of more expensive version?) and well built, using high quality materials. Wheels are quick release and trailer folds down to about 3 inches high with release of one pin (arm to cycle folds under with release of another pin). Attaches to cycle using supplied small but solid hinged bracket, again quick release, plus safety strap in the same way as trailers for cars. front and back zipped entrance with mesh windows, and rain cover at front. Not light, but once on bike it trails very well and carries our 18kg dog v easily with lots of room inside. Best on tarmac and flat tracks, and on the flat and downhill it's excellent; weight going uphill is considerable (I often walk!) and wouldn't fancy long distances but I can't see how any such trailer would be much different... Does everything well, built to last, will also easily carry your shopping or luggage - excellent quality and superb value for money!