Our 2 Pack telescoping art tubes with straps adjustable to tube length can expand from 30.3 inch to 52 inch and the diameter is 5 inch. The round black storage case is made of durable plastic PVC, which is lightweight, waterproof, light-resistant and sturdy to keep your papers safe from folding, creasing, fading or any damage in transit. Our poster holder cases with lids have an ingenious lock design. You can twist the cover or the body to easily unlock and firmly lock the tube following the arrow direction. The adjustable straps allow you to transit the storage tube in flexible ways according to your actual needs. Value Pack: You will get 2 packs of extendable poster tubes. Each telescoping art tube can expand from 30.3 inch to 52 inch and it has a diameter of 5 inch. The thickened straps are also adjustable to the tube length, which makes it comfortable and easier to carry the tube while you're on the go. High Quality: Our round black storage case is made of premium material of durable plastic PVC, which is lightweight, waterproof, light-resistant and sturdy to keep your papers safe from folding, creasing, fading or any damage in transit. Twist-Lock System: Our poster holder cases with lids have an ingenious lock design. You can twist the cover or the body to easily unlock and firmly lock the tube following the arrow direction. Just select the appropriate locking position according to the size of different storage contents. Flexible Carrying: The adjustable straps allow you to transit the storage tube in flexible ways according to your actual needs. You can carry it by hands, by shoulder or cross shoulder so that you can still handle other things while carrying the tube. Versatile Application: Our storage tube is suitable for students, workers, artists, illustrators or architects. It can be widely used as storage for drawings, artworks, posters, blueprints, maps, documents, fishing rods, drum sticks, arrows or whatever else you can imagine.