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> Is there any mechanical pencil that's meant to toss around in a bag and survive?

I'm not sure exactly what the failure mode is that you're experiencing, but the Rotring 800[0] is retractable. I've gotten a lot of use out of my Rotring 600 but wish I had bought the 800 to be able to retract and protect the lead sleeve.

[0] https://www.rotring.com/pens-pencils/pencils/rotring-800/SAP...

The leads tend to break inside the pencil with random cheap stuff

I feel like a shill in this thread, but pencils are my jam. I've kept a Kura Toga (with fragile 3mm!) casually tossed in my gym bag for the last few years. Zero problems with it so far.

I use a non-padded box, it is just a little plastic thing. All that you really need to protect them from is getting dropped or pressed up against something (it is also nice to not get poked), so the box just needs to be somewhat rigid. Padding seems excessive.

Pentel Kerry (https://www.amazon.com/Pentel-Sharp-Kerry-Mechanical-Pencil/...)

Gotta get a pencil bag or pen sleeve