We are flying Nature Air from Monteverde to Quepos and their website says our bag can be no more than 30#. Does anyone know if they really enforce this? I mean my suit case is about 10 pounds with nothing in it. That leaves only 20# for a 9 day trip! That doesn't seem like very much. I was even thinking of purchasing a hiking backpack b/c they only weigh about 4-5 pounds. Do most people bring suitcases? Or do people use the big hiking backpacks? Thanks!