Thanks for the offer of the dog, I could use our spaniel but she’d just chew the bag then give the contents a good lick.
8kg includes the bag which just weighs over 1 kg on it’s own, it has a 33ltr capacity and I do fill it on occasion.
The wieght doesn’t bother me, it’s just the stability. I work freelance so in average my commute is 15-20 per day.
The carradice looks like a good option.