This document discusses different types of package drop testers that are used to scientifically evaluate how packed cartons withstand impacts during transportation. There are three main types: bottom flap opening type, which can simulate drops from any side and lift packages up to 75kg; side arm type, which can only perform flat drops of packages up to 25kg; and hybrid type, which offers accuracy of bottom flap style with convenience of side arm and can test packages up to 25kg. The document also mentions fork lift and sling type testers are used for palletized or heavier packages.