I've walked five miles with an 18" 870 at low ready or port arms before.
Just because you don't doesn't mean someone won't.
Same reason even my house guns have slings. Not having one can really suck. Weight adds up.
"And Shepherds we shall be. For thee, my Lord for thee. Power hath descended forth from thy hand, that our feet may swiftly carry out thy command. So we shall flow a river forth to thee and teeming with souls shall it ever be. In nomine Patris, et fili, et Spiritus Sancti. Amen."