The item "Burlap sack" seems to be bugged somehow.

If you use the item on yourself and equip other heargear while the burlap sack is "on" and then un-equip the sack you are somehow able to get your "eyesight" back and run around wearing the burlap sack as "regular" headgear.

[I couldn't check if it was reproducable because I only had one sack and as well the sack as the headgear-slot bugged afterwards] {F30403} {F30404}