From the prior link....
For someone who does not have a Concealed Handgun License, that person may have loaded magazines or speed loaders in the vehicle so long as:
The magazine or speed loader does not fit any firearm being transported in the vehicle; OR
The magazine or speed loader is in a compartment reachable only by leaving the vehicle; OR
The magazine or speed loader is in a closed package, box or case that has multiple compartments (i.e. a gun case) as long as the magazine or speed loader is in a separate compartment in the closed package, box or case from the firearm, OR,
if the closed package, box or case only has one compartment, the magazine or firearm is separately enclosed in something using a snap, buckle, zipper, button, hook and loop etc. (My best stab at this is it is a one compartment gun case, the gun or the magazine/speed loader would need to be in some sort of pouch that is closed.); OR
The magazine or speed loader is on the person of the occupant in a pocket that is closed using a snap, buckle, zipper, button or hook and loop.
For someone with a CHL, they may have a loaded magazine in the vehicle anyway they wish, so long as any magazine for a non-handgun is not inserted into the non-handgun. (i.e. a loaded rifle magazine may be anywhere in the vehicle as long as it isn’t inserted into the rifle.)