that dicky bag looks just like some of the pencil cases or small chiller bags designed for drinks that you can get for half the price lol

Cheap option Mel , I got a small kipling backpack from a charity shop , it is a back pack but very small, I only use it to carry poo bags , I have out a car air freshner in it to stop it smelling and it can go in the wahing machine, cost me a quid from a charity shop in London , Perfick !

You are a very inventive lot. Some really good ideas there.
I especially like the one to keep the poo warm

I bought a knitting wool holder for about £9 as I wanted one of those "Muksacs" but they were too dear. Does the same job and I just put an air freshener thingy in to keep it sweet-smelling. I got mine on e-bay and it is red with sheep pictures on it.