I would disagree, I had a standard rucksack with no internal compartments and it was a total pain trying to find what I needed. And it didn't go on the handlebars and it was annoying having to take it off every time I wanted something.
When baby was small it wasn't a case of a couple of nappies, wipes and a travel changing mat - it was several nappies, wipes, mat, bum cream, 2 muslins, a drink and maybe snack for me (coffee/water), spare dummies, change of clothes, a toy/teether, hand sanitiser, spare breast pads, purse keys any other essential adult stuff blah blah etc.
Then when a bit older food pouches, spoons, bib(s), bottles.
Even now (21mo) it's food, water, change of clothes (likes puddles), sun hat, sun cream, as well as the nappies etc.
One of my friends had an amazing rucksack with tons of interior organisation and I was so envious. Another had several pouches (changing pouch, parent pouch, misc pouch).
I would consider the Skip Hop Forma next time. Bit expensive. Amazon has loads of knock off versions, that's what my friend had. The label said 'LAND'. It attaching to the buggy handlebar is so useful.