I got these straps similar to luggage straps they are for bundling up wood or something. $5.00 at WalMart in the aisle where they have bungee cords and stuff. Come 2 to a pack, 12 feet long but I just snip off the excess. Seems to work really well. If you go this route, one word of advice, don't undo the strap, just loosen it. Giant pain to get it back through the buckle after you cut the ends off.
Here is a picture:
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