Packing - first time

On Sunday, we packed for the first time for our Guatemala trip. We're using two roller-board duffel bags (with backpack straps for use when rolling doesn't work, i.e. on cobblestone streets) to carry most of our gear. Mine weighed in at about 45 pounds (we're allowed 50 pounds), so I'll need to go back and try again. We don't know what Linda's weighs, but it got to be about the same. We're allowed two pieces of checked luggage each that don't exceed 50 pounds. We'd really like to keep everything in one bag, since we also have a suitcase for our study materials (weighing in at 25 pounds right now), my CPAP (breathing) machine for my sleep apnea, Linda's case for her diabetic supplies and our prescription medicine and our two carry-on backpacks, which will carry our laptop computer and our new netbook. Fortunately, we won't have to carry our gear very far.