The bundle of silk runs from Thompson’s right hand held down low up to his opposite shoulder. The camera was taken slightly below the trio and has a small amount of perspective distortion. (If you look at the columns on the far left and far right, you will see these are slightly splayed apart. That happens when the camera is pointing upwards.) Thompson’s left shoulder is twisted away from the camera, so there is also some distortion in depth.
Three feet is a decent ballpark length of the bundle. It is a little squashed because of the way Thompson is holding it. If you laid it down on a table and pulled the ends apart, the bundle would be longer.
Thompson’s left hand appears to be covering about 1/4 of the circumference of the bundle. Given an approximate hand length of 6 inches for adult males, we can assume the bundle has a circumference of approximately 24 inches, or a diameter of 7.5 to 8 inches.
Suppose the whole bundle was wrapped tightly in plastic wrapping. By my calculations, this would be a reasonably solid cylinder 8 inches in diameter and 36 inches in length.
Yankee suggested 25 kilos. I’m believe that is pretty close. I haven’t been able to find many pictures of bundles of silk with associated weights. I think the photo I provided yesterday was not a full 10-kilo bundle.