Not bad, with some reservations

As written, it is not for big hands. The picture might suggest that the strap is longer than it actually is. (That said, removing the sliding control, which, in my opinion, is useless, we gain 2 cm.)

If the strap itself actually looks solid, I am less convinced by the fastening system between the strap and buckle used to connect the wrist strap to the camera. See the use (it will be fine for compact camera, but with a hybrid or a reflex?).

Finally, the casing of the fastening system mentioned and the slide are not leather. The unpleasant side of it is that you want us to take bladders for lanterns. If not, that's fine it was not necessary to take the life of a sentient being to make this object.