Tried a fair few half decent pocket Binoculars, but even then i found they were too big to lug about for the odd use every now and then.
Now using Docter 8x21 Monocular and i find it's fantastic.
Really really small so i can stick it in any pocket if i'm using it, really light so you really don't even notice your carrying it.
I'm guessing if you were a birdspotter it'd get a bit tiring after a few hours using a monocular, but i've used it far more than my binoculars as i find because it's so small and light i can keep it handy.
They are just generic pics, if anyone needs any size comparisons let me know i'll snap a few pics.
Cheers
Mark