DEWEL Adjustable Poster Tube 76-125 CM, Diameter is 12 CM, Large Plastic Black Fishing Rods Storage Tube, Plastic Waterproof and Light Resistant with Strap (Black XL Size)

This right here, stop looking around for others.

Fell apart (internal structure peeled apart) halfway through first use.

Great tube to contain a long document.At first it is hard to make the extension stay at the desirable length, but once you understand how to lock it, it is perfect.

It doesn’t lock I turn it to where the arrow is pointing, and it does not lock. At the airport all the things fell out that were inside, so that said, I was not happy with his purchase.

I ordered this particular model because I needed 51.5" minimum. The overall 53" length is in the fully extended position and is the outside measurement. When fully extended and locked, this model is not likely suitable for airline travel, but for vehicle travel and storage it will definitely fit most uses. When locked at less than the full extension, there is more overlap between the tubes and hence, more rigidity. I'm using this tube to store rigid whip-style radio antennas called ham-sticks. Each pair of stick antennas will go inside a lenth of foam pipe insulation, and with three pairs, the three foam inserts will fit nicely in this tube. Obviously a very specific use. One thing I did as a margin of safety is wrap the joint where the tubes lock with several wraps of gaffer's tape. This eliminates most flexing and adds rigidity. Buying this tube was actually less expensive than buying the PVC pipe, caps, etc to make my own antenna carrier!!

Was exactly the size I was looking for. A bit too platicy bit its worth the money. Love it!

These work just as described however it is true that they are flexible so will not stay locked in position ... So what i did was put a 4 inch X 36 inch cardboard mailing shipping tube inside (which accommodates my trekking poles) that solves the crush problem & then used packing tape to hold extended tube locked in place. Easy peesy 😃