For what you have, and the portability issue, I agree with Dewey that a shop vac is your best bet right now.
You will want one anyway later on.
I, too, have a Rigid shop vac. I bought it about 12 years ago as a temporary unit. It just won't die.
Mine is the model that the motor comes off and can be used as a blower (like a leaf blower).
What is most important about a shop vac is to make sure it uses a separate fan for the motor's cooling needs. Mine has that.
The reason is it cools the motor no matter how much or how little air is actually moving through the hoses or canister.
So it can be run in a static condition, no flow through the hose at all. And not hurt it. (Remember, temporary, going on 12 years now
)
I bought mine with a manifold system in mind. So it runs against closed gates as a normal condition. Then I gate in whatever I want it to work on (IE: ROS, Hand held router, biscuit cutter...).
Or to move from one corner to another with a hose from gate to gate.
You can get a muffler for shop vac's now. Never used one myself, but I'd recommend you think about it.
Mine discharges into my DC barrel, and ultimately out the DC's final filter. Muffles it real good.
Alternatives to a shop vac:
Oneida Dust Cobra
Oneida Mini Gorilla (You'd have to neck it down)
Either of those would be considered lifetime investments. Meaning they could last as long as you are working wood. And they would have good resale value should things change. And they are made to be portable.
But the prices, compared to a shop vac, makes my sphincter pucker.
And like I said, I'm waiting for my shop vac to die.