Sorrrrrry... bags again...
I've bought the Whsitles Duffy BUT am not convinced (haven't used it yet!) as it seems very heavy.
So I'm now veering towards a Mimi Berry bag and can't decide between honey and spike.
I want to be able to use it every day, be smart enough for work (although my office is pretty casual) but big enough for all the usual toddler paraphernalia - snacks, spare knickers (not mine!), small toys etc. And not be too heavy 
Any thoughts?? I need to order online and haven't seen either in RL.