Weight Weenies

Tubus' subsidiary Racktime does a bracket(Snapit) to attach to your bag, so it will click very easily in out of the rack.

PS: Why do all people want watertight rolltops? They are irritating in daily use and unnecessary unless you dunk your panniers in a river regularly.
Ortliebs "Sport" series made of watertight material but with a normal lid and straps work perfectly well in the worst of storms.

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Have commuted into London for 30 yrs and two recommendations are
1) the tubus vega rack and ortlieb small (front) pannier, waterproof, easy to clip on/off and practical
2) rucksac, ideally waterproof, currently use Rapha one
I travel light, short and underwear only, trousers and shoes stay in office locker so rucsac not too heavy
Means you can take a nice fast roadbike into work, rack and panniers go well with musguards for winter commute
Enjoy