6" seems a tad light weight to me. I'd think a foot or more to be better. If you gotta go and don't have a shovel, just find a big 50 pound rock. Drop your load in a low spot 100 yards from camp and drop the rock on top.
Perfect? no, but better than a measly 6" hole. I got big old greeners longer than 6".
And thank you for bringing up the poo topic. One of my faves!
Quote from Leave No Trace
"Dig the hole 6-8 inches deep (about the length of the trowel blade) and 4-6 inches in diameter.
In a hot desert, human waste does not biodegrade easily because there is little organic soil to help break it down. In the desert, the cathole should be only 4-6 inches deep. This will allow the heat and sun to hasten the decay process. When finished, the cathole should be filled with the original dirt and disguised with native materials.
