I've been looking for the same, I want to ditch my ikea tub for a hanging nappy bag. Have a look at fill your pants, or Google hanging nappy pail. Etsy had some lovely ones, bug I haven't worked the site out yet..
I got double top straps and it hangs on the end of the cot although ds is now in a proper bed so it'll need a new home when I get round to dismantling the cot. If it's full I struggle to get everything in the washing machine - it's a huge amount bigger than my XL Monkeyfoot bags.
@louise can I ask if the patch actually works on the bag and also if I hang it on the back of a door is it likely not to be able to open properly iyswim? seeing the designs has reminded me of the owls wrap I had which has gone missing