I second the KelTec Sub2000. I have one that fits nicely in a laptop bag and travels well with several big magazines and a Glock 17 on road trips. I have a HiPoint 995 that actually shoots better groups than the Sub2k but I hate the 10 round magazines.
I really don't want to put a Kel-Tec in that role. They offer lifetime warranties and their customer use them - frequently.
YMMV