this is a funny creation of mine which summons a chicken with what looks like a backpack. The chicken can't actually hold your items, but it does look hilarious :)
(Note:It only goes east in a strait line,despite the fact that both the slime and chicken will look in different directions occasionally :/ ) you can even make the slime a
magma cube by simply turning [{id:slime}]} into [{id:magma_cube}]} hope you enjoy :)