1 week update: The one in my front yard is almost FULL of flies. There's been a probably 90% drop in flies buzzing around my workbench when I'm in the garage. There's a dwarf apple tree of some sort full of rotting fruit so they won't completely go away, but the decrease in numbers has been great! I don't notice the smell unless I'm right next to the bag and there's no sign of leaking yet. Most of the liquid is gone so I'll probably throw it out and put up a new one soon. The one out back was ripped open probably by a raccoon but it still caught enough that my dog and I aren't being swarmed by house flies in the yard again yet! Wish I'd bought these years ago!Pests of all varieties have been driving me and my dog insane this year; deer flies, fleas, mosquitoes, biting gnats, and house/horse flies. I haven't used this kind of bag trap (even though I know they work) because they're stinky and a pain to dispose of but I'm desperate and SO GLAD I did. I put the first two out about a day and a half ago, one towards the street in the front yard and one hung in a tree out past the fenced-in part of my back yard. They were easy to open (cut a little past the dotted line or the top won't pull out easily), kind of awkward to fill in the shallow sink faucet (I'll use a spigot next time and let the sun warm them up), but they come with a nice hanging wire and it took maybe 2 minutes to set them up. There's no sign of leaking at least in these two.And wow do these things work!!! The one out front has a solid INCH of dead flies in it already. They're buzzing around the top all but fighting each other to squeeze inside and get caught! I haven't gone that close to the one in back, but for the first time all year, I went to pick up my dog's "business" tonight and it wasn't swarmed with flies by the time I walked across the yard! I haven't noticed any smell yet, but I also put them far enough from the house that it shouldn't be a problem.Now, one bit of false advertising is that these will NOT catch deer flies. Maybe the odd one by accident, but deer flies don't hunt by scent. The stinky bait in these will catch regular house and horse flies, probably most of the other varieties listed, but not deer flies. Those little jerks hunt by sight, looking for horizontal motion. They ARE attracted to the color blue, which maybe is why they claim this trap will catch them, but it's not moving and they won't be attracted to the scent of the bait, so they probably won't go inside.I normally use sticky traps for wasps and flies but the Rescue wasp traps have gotten EXPENSIVE the last couple years. The smaller Rescue fly traps aren't quite as expensive, work great, but are full in under a week so those get expensive too. (Yes, FULL, like someone rolled them in a bunch of dead flies!) I tried the really cheap Black Flag brand yellow sticky traps and those were a joke, nothing stuck to them and they fell apart in days. If you don't have that bad of a problem, or don't want to deal with the potential mess and stink of these traps, get the Rescue ones. If you're being driven absolutely batty by flies, get these traps!