Pootrap - The Magic Poop Collector for Dogs
5
This product is insane, and so much more work than actually picking up after your pet with a bag. Outfitting a dog with this sort of contraption to save yourself a few mildly icky seconds is the height of pet-owner absurdity.
Beyond that, It would never work at a dog park or anywhere that a dog interacts with other dogs...I have visions of it getting ripped to shreds, or other dogs grabbing the bag itself with rather disgusting consequences.
Here's a video of it in use for your enjoyment: