I noticed you
bolded the work "combo", signifying you really want advice to stay in the realm of combos only. This is too bad, because you are closing yourself off from gear that could be lighter, smaller, and better able to fit your needs of the moment. Think about it - a combo encloses the amp and cab in wood. So a cab alone wouldn't need as much wood, making it lighter and smaller. And you could take with you to a small practice session your micro head and a 1x10, or if its a bigger gig maybe the same micro head and a 2x10, or 2x12, or whatever. But you asked for
combo advice so here is mine.
Don't get a 1x10 unless you only want to play with acoustic guitars or mandolins in small rooms, your need for volume will very quickly exceed your combo's single 10" driver's ability to produce clean tone. A 1x12 would be the minimum, and you should really plan of getting a second satellite 1x12 cab if you will be playing with louder guitar players and drummers. A 2x10 is a safer bet than a 1x12 by a little, a 1x15 safer still - assuming all have similar xMax values and similarly tuned cabs.
Really, and I hate to say it because I chased this dream for a while myself, but you're a bass player, and for us, its largely true that good tone and perceived loudness equals heavy and big. Take consolation in the fact that even just 20 years ago, stuff was even bigger and heavier. Your option after a certain point is to get a small DI box like a BDDI or VT and go direct into the PA, and skip the amp and cab entirely...
or take up harmonica - those are small and light!
