Well I have to warn anyone of my own negative experiences with the VacExtenders, they are not for every anatomy. I had a LOT of issues using mine. My theory is that skin on the glans varies in strength, and some glans coverings are not as tough as others. I cold rarely go more than few days without blistering using that infernal thing. It made a wreck out of my dick. And I tried all techniques. Works for some though, Not2 being an example.
As for this thing about nooses or loops breaking a lot and wearing out. I have heard that before many times. I think it is because you are using medical grade silicone. The latter is a softer type of silicone that is clear and soft. It does not last very long, a few weeks at best. You can get red silicone cord from McMaster Carr (3/8” diameter, 96505K24) which will last for many months, I know. It eventually breaks but not after literally hundreds of hours. it is ever so slightly tougher than the clear stuff, but ever so much longer lasting too.