So I'm pretty happy about it, just thought I would share. I've been wanting to make one for ages as I've seen more and more people supporting it's uses. I don't know why I never did it before, I guess I thought I would need a lot of room or it would be messy or something. Anyway, I went down to the home depot where they sold sand in sealed plastic bags. I grabbed a few of these and some canvas and basically just put the smaller sandbags in the canvas, wrapped up the canvas into a nice little bundle and then tapped the entire thing up with high strength cloth tape. It looks butt ugly, not as neat as the duffle bag versions and I can't change the weight of it without pulling it apart, but for only $25 to make (canvas, sand, tape) I'm pretty happy. It's not that big either, so if I was back in a one bedroom apartment or in my uni student room, I could slide it under the bed easy. Now I wished I had made it years ago!! I wasn't sure how heavy to make it. After some general experimenting I went with about 140lbs (just over 60kg) which is still a monster (for me). It's really tough and I can see why people rate it so highly. It's also an great change from the barbells. Anyway, I'm chuffed and I'd highly recommend to others to put one together - it's probably easier and cheaper than you think.