I bought this strap for a cigar box guitar, so nothing really heavy in the end and it is perfect for this purpose! This strap is really well made, looks like came out from one of those big brands, but at a lower price with the same quality.
Easy to apply, to adjust and the padding is perfect on your shoulder: you can't really feel the weight of the instrument (it depends on what you re carrying, of course, I have a little cigar box guitar so not that much).
This strap I guess is ok also for mandolins, banjos, acoustic guitars and maybe for some lightweight electric guitars too: I believe it can carry the qweight properly.
In a nutshell, another great product from Harley Benton.