is smaller than a frisbee
is smaller than a can lid
Technically that just tell us that it is not as big as a frisbee nor as big as a can lid. It is smaller than both. 
not Quite
it means it is enlarged !
In SR4A the Microskimmer was smaller than a can lid
now in SR5 it is smaller than a Frisbee, but it must be larger than a can lid, or they would've writtten that, wouldv'e used the same description !
So now the Microskimmer is in Size between a Can Lid and a Frisbee
and that is MUCH bigger than an Eyeball sized or Insect Sized Drone
JahtaHow
Medicineman