They are NOT designed for and thus should NOT be used to pack books, desk or storage cabinet contents, glassware or other fragile items. They should NOT be used if you are packing for shipping by other than a mover. Book Cartons are heavy-duty corrugated containers. They do require the use of sealing tape. Be sure all cartons are propertly assembled.
Cartons requiring sealing tape require that both the top and bottom to be securely sealed with tape.
Carton tops must be flat. All packed cartons must be left closed and sealed. Be sure all cartons are fully packed. Moving damages occur when a carton is over-packed or left partially full. If you can only fill part of a carton with merchandise, the balance of that carton should be filled with packing material, such as bubble wrap, foam pellets, or newspaper.