Most of the reputed manufacturers offer postal tubes in different shapes and sizes. Look for trustworthy suppliers who sell tubes that are designed to perfection. Business owners should transport A3 or even A4 sized documents in mailing tubes. Search for professional finish postal tubes that are durable.
Please read the originial post here: http://cardboardtub.unblog.fr/2020/03/28/buy-premium-quality-cardboard-tubes-for-packaging-online-at-wholesale-prices/