I wonder why most engineers are stingy to buy a can's opener and prefer using flat head screw drivers to open them .
Its only for about 1 buck ..
Yup, most line mechs/techs/engs have purchased these very expensive can openers called leathermans, (other multitools are available but that's a whole new thread) Sixty-odd quid gets you a shiny Victorinox Swisstool. So far from being stingy, they are actually a bit flash with the cash and will do anything to save a trip back to the van for the correct tool.
The GS is old hat now unless opening cowlings or, gawd forbid, actually undoing a large screw!