The seatbelt straps work great. They never wear out and they are cheap.
Some people find them "slidy" and if you have a neck heavy guitar, you might consider another material with more friction on the shoulder.
I prefer leather straps, and my most comfortable one only cost about $30. I think my most expensive is only about $45. $110? For a belt? lolololololol
...so ever since then, I always hang on to the buckle.
