To cyclist 5:

There really is no telling how secure your bike is. If a thief wants it, they will find a way to get it. what you want to do is make it as difficult as possible.

Using more than one type of lock is a good idea. I have the Onguard mini 7. Not as long as a typical u-lock, but not as short as the traditional mini. I am able to secure the lock through the chainstays, rear wheel, and bike rack (similar to sheldon browns method). It is also not heavy so I don't mind carrying it .

I will also carry a cheap cable lock. I can attach that through the front wheel, frame, and a rack or sign post.

My saddle is now secured with an old bike chain looped through the saddle rails and seat stays (wrapped in an innertube). I did this after my previous saddle was stolen .

Locking skewers can also work as a deterrent.

Basically a thief would need an angle grinder for the mini, bolt cutters for the cable, and a chain tool for the saddle.

Not foolproof, but nothing is. If the bike is parked in a lit and public place hopefully they will look for an easier target.

Plus all of the things mentioned are minimal as far as weight is concerned.