I noticed recently that, if you die repeatedly trying to recover your body and leave a few grave markers around with a bit of stuff in them that you picked up on your recovery runs, not only can they be used as temporary "free" chests (I already knew that), but they also can be used in the future to get the corpse run buff. Unfortunately, if you use them as a chest (put stuff in them), that negates the corpse run (according to the wiki).

They are also quite visible from a distance, which can be handy for navigation markers and such.

If you have a particularly dangerous area that you frequent, you might want to consider some strategic placement of grave markers next time you meet an untimely demise in that area.