Lezyne Caddy Sack S or M

Was wondering whether a small would fit a small pump, tube, mini tool and tyre levers? Or is the medium not much bigger and a safer bet? So long as it fits into the middle pocket I don't mind, want to ditch my oversized saddlebag, too noisy as well.
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HTH
Will
If it had Rapha printed on it they could charge 40 quid