Super Savvy Supplies Large Telescoping Poster Tube 30-50 Inches Expanding Document Carrier Safely Transports & Stores Artwork Posters Blueprints-Showerproof Expandable Professional Quality Travel Case *SECURE CAP* So Your Documents Are Kept Safe With Both Carry STRAP For Hands Free AND Handy Sliding HANDLE Some Of The Cheaper Poster Tubes Can Easily be Crushed. Ours Is Made From DURABLE Sturdy Plastic Which Will Not Collapse For Extra Protection Against Damage. STRONG Enough To Be Used In The Hold On Aeroplanes Firm Telescopic LOCKING MECHANISM Keeps The Drawing Tube At Your Chosen Length. Anything from 30 inches to a MASSIVE 51 inches (77-130cm). Wider Diameter- 4" external diameter & 3" at narrowest internal section Best Poster Tube For Back To School, College Or University Gift For the Savvy Student Or For Transporting Large Posters, Artwork, Presentation Displays, Blueprints. Also DOUBLES As Storage for Christmas or Crafting Items LIMITED TIME Buy 2 get 20% Off With Code TUBE204U, Buy 3+ get 25% Off With Code TUBE254U at the office at client presentations at college extend the tube to your desired length, matching the notches on the internal tube twist the inner and outer tubes in opposite directions until you hear a &#034;click&#034; test that the tubes have locked into place To unlock: just twist in the opposite direction and the inner tube will slide free