I did not use a sack or pillow case-----what I did was to take a 5 gallon bucket & spray paint it black. Then fill it up with meat scraps, fish heads, fish guts, rotten fruit, old cooking grease, etc then put the lid on it & poke lots of holes in the lid & upper 1/3 of the bucket. Then hang it up in the tree as you can get it & in the sun so it can really get ripe !! Then the wind will spread the scent out. Hang it high or the bear will rip it down !! I have also heard of filling up a pillow case with bait, grease,etc & dragging all over the trails leading to the bait site !! Hope this answers the qwuestion.