Much, of course, does not fit in, but you knew that beforehand. The widespread 25L garbage bags fit well in the 15L bucket.
Unfortunately, the specified width is incorrect. The 20cm refer to the bin itself. However, this has on the sides still have a system to connect the bucket together. Trying to remove them has led me to a (negligible) damage to the bucket. It would be desirable option, also in succession to secure the bucket together.
Another shortcoming ... the lid holds good only at the front of the trash can, on the back is only on this. However, even that is to get over.
All in all a good product, a little improvement, there's always. I would buy the bucket again.