Well I can officially say I LOVE this bag. I have used it on both my Baby Jogger and Graco Strollers. (As well as on the back of a wheelchair). It holds so much! I can fit diapers, wipes, tons of snacks and still have room for 2 or 3 cups, my phone, keys, wallet, etc. There is also an insulated bottle or cup holder.
I love the way the straps clip on to the stroller. They are adjustable so you can transfer from stroller to stroller with ease.
I am buying 2 for John's car for each of the boys to store snacks, ds, etc in for long car rides.
You can purchase on Amazon.