I followed directions here.
Old climbing rope
Caulk, super strong glue, or some really strong/durable sticky something!
Ok so some directions say use needle and thread to hold your rope together as you turn in around into a spiral. I say nonsense! Use a staple gun! But use lots of staples. My first attempt didn't stay flat. I wound the rope too tight and didn't use enough staples!
Then cover with glue. I used a piece of cardboard to spread it around. Make sure you get it in the cracks!!
Let dry over night. Then cover the bottom with duct tape. I know it is lame, but it does need a little extra on the bottom. I think they are best for indoors not out.
And voila !