The box I have here only has about 25% of the original content left, and there were no shipping weights listed, but as I thought about it, there was probably an outer box and it is long gone.
As far as the seams between sheets, I just over lapped the edge of the 1st sheet with the 2nd sheet by about 1/4" and rolled it down tight.

The NOICO is a product of the USSR. There is an American equivalent, but its real hard to get, often out of stock, and a lot more expensive. I tried several times to buy the USA product, but it was always back ordered, then wouldn't show up on line for a month or two, then within a week it was back ordered again. One would think if it sold out that fast, someone would up the production to sell more, but this has been going on for more then a year. The stuff from Russia is good stuff, and easily available. Gene