Originally Posted by
MSPeconomist
IME FC blankets are usually folded and sealed in plastic (maybe to signal that they've been cleaned) while the extras in bins aren't. Also, on long/winter/night flights, the extra blankets tend to be claimed very quickly.
I’ve seen both before. Most of the times, the extras in the bins are sealed and the non-sealed ones are dirty from the previous flight that the cleaning crew just threw up into the bins.