Five years ago, an ad for Glad ForceFlex trash bags showed their material stopping an elephant's charge: Tusks couldn't puncture the plastic. At the time, we found that ForceFlex was actually more apt to rip than was competitor Hefty Ultra Flex. Fast-forward to today, when an ad shows a couple of movers dropping a piano from a great height, then bagging the broken bits in ForceFlex, which has "stretchable strength." Clearly, it was time for a rematch.
No, we didn't destroy a piano. We mimicked one, stuffing about 16 pounds of jagged wood and metal pieces into 30-gallon Glad ForceFlex bags and Hefty Ultra Flex bags, which claim "puncture protection." The Glad bags are 1.05 thousandths of an inch thick; the Hefty, 1.3. We put the 11 pieces into 10 bags of each brand, using the same order of pieces each time. Then we added two 10-pound weights and one 5-pounder.
Be glad if you use Hefty. Although some pieces poked out, each bag held all the "piano" parts plus 20 to 25 pounds. No Glad bags did as well; some dumped their contents even before we added weight. And 25 Hefty bags cost just $7.99; 25 Glad bags, $9.99.