When it comes to finding synonyms for the term "barn sackful," there are a few options that can be considered. One potential synonym could be "hessian bag," which is a type of woven fabric typically used for packing agricultural products such as coffee, potatoes, or grains. Another possible option could be "grain sack," which is a sturdy bag made of natural fibers such as linen or jute, used for storing and transporting large amounts of grain. Finally, "feed bag" could also be considered a synonym for "barn sackful," as this term refers to a bag used to carry animal feed and is commonly made from material such as canvas or nylon.