Oly OMD and lenses: minimalistic bag (already in accessory forum)

Hallo everyone,

I have an Oly OMD-EM5 with 12-50 kit zoom. My ideal kit would include a Pana 7-14, a 20 mm pancake (or17 mm), and a long zoom like the Pana 100-300. All in all these should weight about 1.5 Kg.

I need a bag for all this (I am thinking about future purchases as I do not yet have all these lenses) but I do not see the point of buying a bag that weighs just as much. I am looking for a very minimalistic small and light bag, easy to carry. Possibily to carry like a backpack, not a waist bag. I really cannot find anything in this regard.

Either too big, heavy and fancy or small waist bags (which I do not want).
Thank you for your input.

Mattia