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"  (Photograph by Chris Eckert/Studio D)  THE BAGS * Hefty 2-mil ($10 for 18 bags) * Grip-Rite 3-mil ($15 for 20 bags) * EconoGreen 3-mil ($17 for 30 bags) THE TESTS  Weight Capacity We started with a 20-pound slate paver and added weights until the bags burst.  Hefty 2-mil: The thin, stretchy resin held until the load hit 40 pounds.  Grip-Rite 3-mil: Despite being thicker than the Hefty, it actually held less weight--a tear appeared at just 35 pounds.  Econogreen 3-mil: Our strongest bag stood up to two testers hauling 65 pounds of weight before it finally tore. Abrasion ResistanceTo simulate dragging a bag over pavement, we used 220-grit sandpaper and a 5-inch random-orbital sander to bore holes in taut plastic.  Hefty 2-mil: Dime-size holes emerged in the Hefty after 5 seconds of intense sanding.  Grip-Rite 3-mil: This bag&amp;#039;s glossy finish seemed to act like a protective layer--it took a full 12 seconds to sand through the sack. Econogreen 3-mil: The bag&amp;#039;s coarse finish seemed to work against the bag, as it gave the sander something to bite. We were shredding through the plastic after only 2 seconds. Puncture ResistanceWe jammed the bags full of pointy broken branches, tied them tight and counted how many twigs poked through. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/technology/reviews/a5228/4340355/>