As the founder of the Woolly Shepherd and one of the first people to work out how insulated wool packaging actually works all I can do is say that if you go with the wool you will not regret it! If you collect and re use your boxes you will be able to re use the liners many times, however if you need to send them with no possibility of a return and reuse, put a leaflet in the box saying what the purchaser can do with their wool, will make customers really value the packs if they see they can be used for a variety of other things, such as hanging basket liners, upholstery wadding, hot water bottle wadding in quilted covers, etc!