One of the best loop knots I know is the double re-threaded bowline. It backs up the loop so that if it is in a place where it could rub you have extra strength and it bites on itself in such a way that it can’t come undone by accident, but can be released after ANY amount of tension.
I can post a picture if you want?
Jon
…and if you don’t want to use as much rope there is also the classic water bowline where you make a bowline, but at the point where you make the loop you make a clove hitch and proceed as normal. That’s a really stable knot, as well as being quick and easy to tie, it’s actually easier than normal bowline because there is no right or wrong way through the loop because it’s a hitch 
slightly harder to undo than the double re-threaded after it’s been loaded though!
Well, there are infinitely many bowlines among which some of the more
interesting/useful ones haven’t been presented (or presented widely). What
you call “double re-threaded” is to most knotty folks a Bowline on a Bight,
but tied with the end; given that one needs (in climbing, to tie into a harness)
to use the end, it’s rather stupid to stick to the in-the-bight form–there are
better finishes, which give the working end a loftier lot than playing twin to
the main line!
It’s not clear how all so “classic” the Water Bowline is (at least, CLDay casts
some skepticism about its heritage), but I don’t see how it’s nearly as easy,
even, as tying the common Bwl; and as for “wrong way”, well, I can envision
some rather wrong ways about it–such as orienting the Clove part the opposite
way, which can lead to a jammed knot. OTOH, I’ve just been playing around
with this base as a solution to the Bwl-loosening-in-kernmantle problem, and
there are some fun variations along this line. The “wrong way” you imply for
the Bwl arises from a tying method that itself shouldn’t be part of the climber’s
main set; you should be getting the rabbit through the hole AS you form
that hole–in one smooth motion which ensures “right way” orientation.
And “wrong way” thereafter–i.e., tying the “Dutch Navy”(misnomer)/“Cowboy”
vs. “Right” Bwl–, is not so much a real issue or as preferable one way as
many tyers seem to believe.