Doesn't have an inner bag. I take the laundry, by hand, out of the laundry collector and throw it into the washing machine.
According to my measurements, it is 59.5 cm wide, 40 cm deep and 55.5 cm high.

There is also the possibility to detach the bag from the rack, but I never do that, I take the laundry out of the bag by hand, that is absolutely no problem. I use the laundry collector to separate 40° from 60° laundry, the bag is always big enough to collect a week's laundry, for the 60° laundry I even need 2-3 weeks to fill it, but there are only two of us.