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it's this!
https://www.tokyobike.co.uk/outer-shell-drawcord-handlebar-bag-97422306.html
it's a bit pricey but after using a few, it's by far the best working one i've used, you can open it on the move and it's a decent size, with voile straps and good foam spacers it's pretty secure too!
@spotter this is sick - am looking at possibly moving that way for similar reasons, with it being so quick to get into town on the overground seems quite attractive.
What bar bag is that please?