i've always used Mut Mitts which are pick up bags that are double ply in the part where your hand goes. I've used the thinner single ply ones and have found that given the choice i would take the double ply.
I have twisted the neck of them after the poop is in them and then tied them with a wire twister thing from the market.
Then, at first, i used to put them in a big trash bin in my backyard, lined with a 30 gallon bag, and a sealing lid. Twice a week, the trash would be picked up so twice a week i'd put the 30 gallon bag in the dumpster, tied with a twister.
But i soon found that whenever i opened the sealed lid of my backyard trashbin to put newly filled Mut Mitts into it a couple of times a day or so, the odor from the tied shut pick up bags inside was so bad, so strong, and just gagged me, and the smell would linger for quite a while, and i learned before i opened the bin to first make sure the door to my home was closed. So even though the little bags were knotted shut and tied with a twister, that odor sure did get out.
So, then i found that it was better if i did not put the sealing lid on the bin, and just tossed the little bags in there, leaving the lid off, and put them in the dumpster to be picked up twice a week. That is pretty much what i've been doing. I do still smell them now and then, vaguely, but nothing like when i used to keep the lid on the bin.
Also when out on walks, i pick poop up with Mutt Mitts and put it in city bins.
I am not that happy with keeping these little filled bags in my backyard, and have been putting them in the main dumpster more often than twice a week. I haven't smelled odors coming from the dumpster, miraculously it seems.
Once, Claire on this board, Woody's mom, told me her mum had found some kind of charcoal stuff to put into the trash bin that eliminated odors. I searched on the web but didn't really find the right thing at the time, and have since not dealt with it.
Back when it was kind of a crisis where the smell coming out of the bin that had been sealed was traumatic, i looked into those little septic tank or cess pool things they sell at the pet store, but something about it worried me, and i didn't get one. I guess just the idea of putting so much waste down a hole in my little backyard, and also, i rent, i don't own the place so i wasn't sure it it would be ok with management.
I would like to hear feedback from anyone who's used one of those, and would also like to hear from anyone who's used any kind of charcoal to take care of trashbin odors.