We haven't had a thread along these lines for awhile.

What stuff do you find usefull for LF photography that come from the grocers, big box or hardware store ridiculously cheap?
For me:
GI army surplus water cooler bags for carrying the 8x10 & gear.
Hefty zip lock bags for protecting film holders from dust.
Shower curtains for diffusing suniight, a ground cloth or protection from rain.
Well laundered cotton cloth diapers, for lint free cleaning
Lemon Pledge, for protecting wooden cameras
Big thick purple rubber bands off supermarket broccolli, as spares formy Lee filter holder onner
Hip flask, for snake bite remedy