I have a disability that leaves with the use of only one hand.  The opening is easy to find!  The design makes it easy to do a one handed turn about to reverse the bag without touching or smelling poop.  I give it a simple twirl and done.  All the makers claim their bags are big and thick.  Well, they tend to exaggerate alot!  These bags are large and they are thick and they don't have a perfumey smell that adds a sickening smell to attempt to mask the smell of poop.  I never understood that anyway. I suffer migraines and bad scents trigger headaches.  I gather all the bags in a 5 gallon hinged can with a yard bag as a liner.  My backyard is romp ready for the dogs and you can't walk by and smell poop from my yard or trash cans.  I have a medium and large breed dogs.  Thanx to ther reviewers for thorough reviews that prompted my purchase.