Wait, you're flying and that's the problem?
Thats a non-issue, ALL airlines will allow you 1 guitar or bass gigbag as your main carryon (brazen customers like me have even gotten away with a two-guitar gigbag).... furthermore, anything that looks like a computer case or briefcase or 'manbag/purse' does NOT count as a second carryon.
And, the other unspoken secret? If your stuff still doesnt fit, airlines will generally let you walk in with any amount of plastic bags you can reasonably carry, as well as large items of clothing like winter coats or whatnot. (As long as you simply DO NOT ASK)
For example, flight optimization 101 for long visits to anywhere:
1) winter coat in hand
2) any heavy boots you need on feet (just take em off as soon as you're on the plane)
3) around 10 kg of crap in a 17" laptop bag
4) anything else that didnt fit in plastic bags in hand
5) gigbag slung over shoulder... you can also 'optimize' some other crap into the pockets
I've shamelessly walked onboard with like 40 kilos of stuff total as in-hand carryon