Anyone got/used a Babymule changing bag?

[rrreow]

Expecting DC2 in June (DS1 will be 2yo) and was thinking a rucksack changing bag might be handy especially as I'm hoping to carry DC2 in a sling as much as possible.

We currently have a Bababing bag which is extremely bulky but hardly anything fits in it, let alone supplies for 2 kids!

A google search for baby changing rucksack brings up www.babymule.co.uk but they're quite expensive and I haven't been able to find many reviews. Anyone got experience with these? Or am I better off just getting a regular backpack and putting a separate changing mat in it?

[rrreow]

It's funny about the Bababing isn't it?! Looks so incredibly functional and fit for purpose but it just doesn't deliver on the inside.