These are great pants to wear anytime you are going to be active in dirty settings.  Deep pockets allows storage of large items.  The rip-stop material keeps them from being damaged by catching on something.  I have worn 511's for years, and have used them often when needing cargo pants.  They allow you to move easily and carry large items in the pockets.  The older cotton pairs I have do not look as good as these.  I highly recommend them.