Telescoping Night Stick, print-in-place
Toy night stick / baton. Might help you assault a bag of potato chips, but let's not kid ourselves about the sturdiness of PLA against tougher foes.
Prints nicely without supports or need to assemble. Extends from 112mm to 290mm.
Tinker with the model at your leisure:
https://tinkercad.com/things/jsS2jZhKOB6
Uses the same modelling technique I detailed in a tutorial for a collapsible bowl: https://www.thingiverse.com/thing:2441950.