Yeh, I get that, but - what with being the bass player an' all - I get to bring all the "Leads, batteries, effects, tuner, tools, anything else required in case of breakdown or emergency when gear goes wrong" for the entire band.
And the entire PA and lightshow.
But a fairer answer to the OP would be a Makita semi-rigid toolbag for my personal foldback & instrument leads + a Stanley toolbag for amp & pedals.