the first bag i used had a huge hole between the "thumb" and hand portion! who'd want to use bags that have holes in them? gross! the mitt shape is a good idea and the bag is pretty big - it's a shame these bags are so poorly made!
We have bought these bags before, and prefer them for clean-up after our corgi. We especially like the fact that these bags are mitten-shapped (they have a thumb), which makes picking up much easier than with an ordinary plastic bag, and that they are long, so there's plenty of bag to tie up when done. Also, they're biodegradable, so if you're on a long hike and decide to pitch the bag into the woods instead of carrying it around all day, both bag and contents will all dissolve and disappear, eventually. However, I'm not sure that they're big enough for the output of a large breed dog.
Finally a pick up bag that gives you total control lol seriously though works so well, I don't ever EVER I mean EVER EVER have to accidentally touch my dog's no goods again. I love it especially on those wet poo days grooooossss.