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You'll always fill whatever bag you take, and running with a bag isn't much fun - so I'd definitely recommend not going much bigger.
FWIW, I wear my inov8 race vest for my long runs where I take full waterproofs, hat, gloves, gels/snacks in the gel pockets and the 2 x 500ml water bottles in their pockets, maybe a sandwich and a spare layer, and phone etc, and that all fits in there.
Nef
Decathlon do one for under £30. Something like 12l capacity and a 1l water bladder. Perfect for not carrying much stuff, not so good if you need loads with you.