These bags are sturdy, well made and well thought out - and contrary to what some have said the DO stand up on their own. I have two, and they both stand happily on my lawn, swaying mockingly in the gentle breeze as I sweat my way round another round of summer lawn mowing.
No matter how poorly I treat them for their insolence they just keep on going; rubble, earth, grass, leaves, branches, thorns...you name it and these things will lap it up.
The handle on the bottom is also great for emptying those last remnants of rubbish that always try and stick to the bottom of bags like this, as well as for hanging them up in the garage upside down to help prevent any creepy crawlies/rodents munching their way through or trying to set up home in them whilst they sit unused.
Overall, these are the best sacks I've tried. Get them!