In the summer the poo dries out quite quickly and is less messy to pick up, so I collect it after a day or two and have a few days in a bag. In the winter leave it overnight and it is frozen solid in the morning, and again easier to collect. We are in Scotland though, and get frosty mornings! Plus our garden is large so a couple of poos lying around is no hassle. Might not be so pleasant in a smaller garden though. I use a poop scoop to pick up.