What is the baggage allowance on flights from Belize City (international airport) to San Pedro?

One web site I found says 40 pounds, the ticket jacket from the US agent for Maya Island Air from whom we bought our ticket says 70 pounds.

Is it just a weight limit?
How many pieces?

We don't travel heavy, but the fact is that carrying cameras, electronic support gear for the cameras (digital, needs batteries, chargers, ...) snorkel gear, clothes, and other necessities, even traveling light could go over a pieces or size or weight limit for a small airplane depending on the carrier's setup.

We will have one full size "Pullman" suitcase (30", under 50 pounds), one 22" "rollaboard" (40 pounds), a laptop bag, and a medium size backpack, maybe a purse.

Thanks!
-Jay