Never seen a use for a Monocular for hiking or ETS use. Instead, for GP hiking, I carry Bushnell 7x21 binoculars. Not the best quality but they are cheap, lightweight and compact and I do not have worry about expensive replacement if they get damaged or lost.

If I am out hunting, then I will carry a better quality and bigger binocular. And for very long distance viewing, a spotting scope.
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.

John Lubbock