As you would expect from a Manfrotto accessory, this product is very well made indeed. It feels tough and durable, without sacrificing any comfort. The carry handle is sturdy and made from a ribbed rubberised material for a good grip. I use it with a
Manfrotto 055XPROB, but it could probably be used with other models and even different makes as well.
The strap is exactly as you see it in the picture - it does NOT extend except in the most trivial fashion possible, and it CANNOT be used as a shoulder strap. All it does is add a carrying handle to your closed tripod, keeps the legs together with a quick-clip velcro loop, and doubles as a weight hanging strap to stabilise your tripod when fully extended.
There is a snap clip at either end. One connects to your tripod when the strap is in use as a carrying strap, with the velcro loop going around the tripod legs at the other end. The other snap clip can be used to clip onto a camera bag for use as a stabilising weight, or connected to the tripod if your model has a suitable connector on the legs.
All in all a good product, but I would have appreciated at least some scope for extending the length.