To point out that it's PACKED lunch and not PACK lunch?

[ICameOnTheJitney]

I keep seeing threads on here where people say "Pack lunch" I KNOW this belongs in Pedant's Corner but hey...only people who already know will see it then!

I also get irritated by "mash potato"....it's "MASHED potato" ffs.

Sharp lilly hence the reversal of the order but the term for the carrier is a pack so your lunch is carried in a pack or you can carry a pack on your back.

You can, however, pack your back in, if you put too many items in your backpack.

Yes, backpack is a closed compound word; you can make the argument that pack lunch is an open compound word or is in the process of becoming one. Then one day it may become compound: packlunch.

I mean one day it may become a closed compound word.