What do you use for a "sink" when you're in the woods?

[EngrSorenson]

Dig a shallow spot, line it with a garbage bag, instant sink.
Dig a larger spot, cut the garbage bag open, instant bathtub.

This is very clever- thanks for this suggestion!

 

[Bob Denman]

Dig a shallow spot, line it with a garbage bag, instant sink.
Dig a larger spot, cut the garbage bag open, instant bathtub.

Absolute minimalistic approach...