Not deep leica M5: which lens ?

[LOOP]

Hello. I have read that the M5 cannot accept collapsible lens (so not to disturb the metering), my question would bewhich would be the smallest leica lens to use with this camera, so that it coul be "near pocketable" ?
I do not think this camera is so big ! Not as heavy as a zorki 3...😱 😕