OK, this is the post that finally made the band-tightening thing "click" for me. I was at a loss for how I would do a second lark's-head knot (I think that's what the rubber band knots are) when I put the band on the bag. Hantzt's phrasing ("wrap the tubes or rubberts two times around the loop") made me visualize, duh, wrapping the band an extra 360 before it passes under itself for the lark's head. "Double lark's head", not "one lark's head and then another."
I probably would have figured this out a lot sooner if I didn't schmoke so much crack.
Glad that you understood my discription! Sorry for my bad English.
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