I got bags like this (mine were black and yellow):
http://www.northerntool.com/shop/too...3533_200493533
And bought webbing straps with buckles at Academy, sewed them on the toolbags, and have used the result for many miles now. You can cut the handles off, by the way.
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"be careful this rando stuff is addictive and dan's the 'pusher'."