Good photography bag to double for clothes?

So I’m traveling to Vancouver in a month for vacation and am planning on bringing my camera and two lenses.
(Sony A1II, 28-70F2, 100-400 f4.5-5.6)
I have a pelican air 1535 and was planning on putting my camera and lenses in there plus whatever clothes fit in there as well.

I want to avoid checking a bag and was curious is anyone had any camera bag recommendations that I could use to store clothes in on the flight?
I’m going whale watching and hiking there and will be there for 6 days.

I just don’t like the idea of having my camera gear inside the camera bag under the seat of the airplane. I like the pelican case since it has more padding and protection.