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schleazy-
Best bit is it only weighs 1.5kg. Keep a cheap bicycle rain cover inside to protect anything larger that needs shifting.
Now need to swap the inner tube ‘tressage’ for the official webbing to take advantage of (probably) the best £/gram saving ratio in cycling which should lighten the front end up around 2.5kg
lmamammal
Ortlieb big zip 140l almost seems like it was made for the Omnium: