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You'll probably struggle with a Klickfix mounted one - the few I've used all project far enough forwards that they'd be in the way of the cable coming out the shifters.
Just got one of these though (I love it!) and pretty sure you'd be ok with it: https://www.ortlieb.com/en/Accessory-Pack/
Brookly_Bay-
That is in line with what I thought, and my consideration of the carradice zipped roll (which I think hangs lower, but I have stuggles to find pictures on a drop handlebar bike) I may also look (for the price) at
https://www.decathlon.co.uk/100-bike-handlebar-bag-25l-id_8383692.html
or even
https://www.decathlon.co.uk/junior-front-bag-pink-id_8380516.html
Both of which look as if they could give a couple of extra litres space.I take it your suggestion also just hangs below the bars? Do you have any issue using the tops?
Now new Tiagra is internally routed there is also the option of new shifters. First step probably to see how much I can get in the SWR tout.
sidewinder
Anyone experience of using handlebar bags with externally routed shifters (I have Tiagra 10-speed). Looking at photos, the clickfix style boxier bags look like they may project too much, but I am wondering about using a carradice zipped roll or similar.
Planning on a light/credit card tour or two this year, ~week long but staying indoors, happy to go for 1 bike outfit and 1 evening outfit. Have a Carradice SQR slim (~16 litres) which I use for cummuting and can use, but am considering if I will need a little more space/accessibility and if so whether to go for handlebar bag, in particular for stuff needed in the day (+ stem/small frame bag if it's not enough, though would like to keep access to 2x750ml bottles), or to get a rear pannier rack and 2 small panniers(http://www.carradice.co.uk/ranges/carradry/carradry-front-universal-panniers-old-design) then likely ditching the SQR slim. Bike (Genesis Vapour Disc) has rear pannier mounts but ~no chance of using front pannier rack.