My friend bought one of these a few years ago to take to Glastonbury to put over her tent and to give us some outside living space and it has been with us every year since for the last 3 years! The tunnel fits perfectly over her Gelert Tornado 3 Man Tent - Royal/Excalibur Grey
and gives enough extra room to fit 4 people comfortably on camping chairs underneath it. You do have to be a bit careful about wind direction when putting up the tunnel as it can blow a bit in the wind, but if you peg it down enough then it shouldnt cause too much of a problem. It's so brilliant that I am just about to buy one to take to Glastonbury this year!