For reference, I'm 5'7 and about 66kg. Clearly I don't make a very good mat model, but that should at least give you some idea of the mat proportions. Short Review: The Zebra Home Training mat (5 x 10 feet and 3.5cm thick) is light and easy to transport, with enough padding to safely practice BJJ, though I'm not sure I'd recommend using it for heavy takedowns. The mat is quick to set up, as it rolls out for immediate use. Storage in the attic would work (if you are sure the 45cm circumference roll will fit through your hatch), but otherwise you would need a space at least five feet high to store them regularly. To spar on these comfortably you would want at least two, but for drilling and light sparring, one is good enough. There is no fastening system: to secure two or more together you have to use tape. Full review, with more pics here.