My dad had an old pair of World War II field glasses, given to him by his grandad. They were fantastic quality with some unbelievable magnification and huge lenses for low-light work.
Only problem was, at that magnification, you had to use a tripod or it shook like crazy and you could never see anything properly.
So, what's my point?
Well, low magnification means more light gathering and better image stability. I was carried away with the idea of high magnifcation and it really didn't work for me. Low mag also usually means less glass (depending on size of front-end optics), so lower weight and cost.
You could also try a monocular - I got a cheap, rubber-coated one from Decathlon for about 5 quid. It's small, gives a reasonable magnification and does all I need it to do. Admittedly, quality isn't great but I wouldn't be that upset if it got lost and it weighs nothing, so I'm more likely to carry it.
I'm rambling now....