Lots of excellent recommendations.
I would consider 25mm to be a real compact lightweight binoc. though.
Hikers I know are pretty obsessed with keeping weight down, and things can get bumpy.
I would probably pack the Nikon Prostaff 8x25 if things were tough,
a Bushnell Legend HD 10x25 otherwise (due to the big distances).
And...between the two, sort of, an Opticron.
I see so many great things at the bhphotovideo in 25mm. though.
Going to 30mm is helpful, but the weight does jump a lot..at that price range, anyway.
I have the Opticron 10x25 T3. It isn't super-pricey, but it's a joy to use, sharp and saturated.
For me, at least, they work great with glasses...that's not common at 25mm objective size
(so check the eye relief)
And.....11 ounces! Hiking hills....30mm or 30mm. Mountains, this in a freezer bag.
They have a pricier 25mm still under $200. Very nice.
For low light, 7x25, but you would need to go back in history for that.
I keep forgetting: Nitrogen purge is nice, but the gasses equalize with the
atmosphere in a couple years. Only metal-glass joints don't diffuse.
The low-E window people learned that. So....meh.