As I fulfil the traditional bassist's role as PA man, I've got mains extensions, mains leads, XLR leads, etc, so those all go in a wheelie suitcase. Bits for the bass go in the bass gig-bag. Everything else that needs a home (tablet to control mixer, last minute thoughts, spare T-shirt & towel) go in a Spada laptop bag that was a free gift at the Motorcycle Show ten years ago https://spadaclothing.co.uk/en/moto/products/accessories/luggage/gonzo-laptop-bag-luggage