Definitely a good buy for the price. It beats buying boxes of 4 gallon bags to scoop cat boxes! Cost is 1/3 or less. Size is definitely 9x12, I measured a bag. If you buy these for the same purpose, know that the bag doesn't open very wide, if you have a large stainless litter scoop like I do you will need to finagle a bit, the opening is smaller than the scoop! Made more for keeping with you when walking a dog, but it'll work for what I intended.Very easy to use, easy to store, and this product gives you more bags for your money compared to others. I use it when I clean my cat’s litter box. The container is a good, small size, and it has a loop where you can hang it up on something. For a dog, I’d assume the loop is meant to be attached to a lanyard or key ring or something when you go out for a walk.I went through one entire roll in about a month and a half.These are decent quality bags that are a nice bright color. My girlfriend and I use them to dispose of waste from our cats litter box since our city recently instituted a plastic bag ban. You get a lot of bags for a very good price. The dispenser that comes with the set has a nice sturdy clip that hasn't broken for us yet. My only minor complaints are that the bags are a little small for a standard litter scoop so it takes a bit of maneuvering to get it in there and that the top bag may rip a bit when opening a new roll because of the stickers and the bags not being very durable. They might be a bit better for disposing of dog feces due to their size, but they are functional enough for our cats.I ordered these for scooping the cat box. Sometimes my cat is naughty sometimes and leaves presents right in front of the box, too. So we were going through a ton of plastic grocery bags (and I prefer to use reusable bags anyway, so keeping a supply was even a challenge). I scoop the box every day, and these are just enough for one day's mess (2-cats, one per box). Unlike other reviewers, I haven't had trouble with the standard scoop being too big, since I'm not trying to actually put the scoop into the bag. With so many, going through 1-3 bags/day (the cats have one preferred box, so the others get scooped less frequently), they will last me for yearsBest price around as I can't find this quantity for a better price at any local stores. These will last a long time since there are so many bags. It also comes with one of those handy bag carrying devices which works quite well. I use them for my cat litter box. Usually, when I clean the cat litter I bag it up and put the cat feces in my trashcan, causing the trashcan to smell. These bags don't smell the feces in the bag too bad. I like these bags. Of course, these bags aren't the super high-quality bags. They are regular everyday use bags.I was previously using old grocery store bags to clean out my cats' litter box. Recently we started using reusable shopping bags for our groceries, so I had to find an alternative to clean up after the kitties.The bags are fairly thick, I haven't had one rip or anything like that. They're wide enough for my litter scoop to fit in and long enough for me to tie a knot at the top after cleaning both litter boxes (2 cats). There's no smell or anything that I've experienced, it keeps everything sealed away.I had forgotten they came with a dispenser, which was a cute little surprise when I opened the box.I live in California so no more plastic bags at the grocery store; they were outlawed. I ordered this product to clean the poop out of the two litter boxes that my two male cats use. This product is FANTASTIC. The bags are strong and I use them daily. I have a LARGE metal scoop shovel that absolutely DOES fit the large opening of these bags. After the bags are filled, I tie them at the top (I don't use ties; I use the top part of the plastic itself) and then dispose. GREAT PRODUCT.