I’ve tried all the suggestions made so far by other commenters, and they are solid options IMO. One of my personal requirements has been that the writing tip is either smooth/rounded, retractable, or covered in some way, because I use my pencil a lot every day, and I prefer to keep it in my hip pocket. If a fine tip is exposed, it gets caught in the fabric and/or bent.

For a long time the GraphGear 1000 was my favourite because the tip retracts and it has a sturdy metal body. But it’s quite long and heavy, and I had to use the clip, which has a somewhat flimsy hinge joint. If the clip gets ripped off (happens to me) it renders the pencil useless because the clip holds the tip out for writing. I also used Orenz pencils for a while because I like the lead-protecting sleeve, but the tip doesn’t seem to be designed to be repeatedly pushed back into the body, because they always start jamming on me pretty quickly.

A few months ago I discovered the Pentel Kerry and it’s my new favourite. It has a removeable cap to protect the lead when closed, and to use it you remove the cap (friction/snap fit) and put it on the other end of the pencil like you would with a regular pen. The tip of the cap has a spring-loaded button which connects with the lead advance button on the main pencil body, so you can click on the rear end to advance the lead as normal. Unfortunately I don’t think there’s a metal body version, but the plastic feels quite sturdy to me.

I’ve never had one myself, but a few of my friends have had Crumpler bags for years and they swear by them.

Crumpler is an Australian company started by some bicycle couriers who couldn’t find really sturdy bags that suited them. I believe that the story goes that one of them was trying to carry a slab of beer (24 cans packed in one flat layer) to a friend’s party when his bag broke apart, and that was when they started making bags for themselves.

They’ve been around since 1995, and have quite a range of bags and backpacks now.