The temptation is to buy the biggest trash bags you can find. If you are working in close quarters, it is better to go smaller in the 30+ gallon range. Buy bags with drawstrings and most importantly find the mil thickness on the box. Go no lower than 1.1 mil. 1.3 if you can find them. It seems common sense, but don’t put sharp objects in the bags. But, as you are bent over scooping up hand fulls of stuff it is easy to place pointy objects in the bag. The smaller bags will still weigh enough to alter your walking as you move over the covered floor (covered with 6″ to several feet of stuff).
A wheelbarrow is a handy means of moving multiple heavy bags toward the drop box.