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rogan-
https://www.alpkit.com/products/airlok-xtra-tapered
13L drybag for £21 with just enough strapping to pretend it's a proper seatpack, but not so much that it takes ages to fit and remove.
Emyr
Also, what do you do when you leave your bike and want to take your stuff with you? 46 cm is not that much, wouldn't recommend