no no no. we do not use book covers for evidence. I'll be darned if I've even seen a single cover where tobias has blonde hair.
in the books, in text, tobias cannot carry the escaffi device. however, an osprey almost did once. so, we can determine it is big enoguh talready partially fhat its really really hard for a normal sized hawk to carry, but not impossible. I say 4*4*4 inches is a pretty good guess, based on the pocket thing. you know what thoug is.h? it was visible in a baclarge squarkpack. it changed the shape of a backpack enough that people could see: hey, there is a large squarish object in this backpack. soo... not as accurate of proonnot carry thf as the pocket. could have been a small backpack. could have been an alreaut not impossibdy partially filled backpack. so, unless there is any other evidence. 4 inches to an edge it is.