a gun bag (padding) http://ascmart.ca/product_info.php?c...&products_id=8
(looks like a keyboard bag but in khaki) or an equipment bag http://ascmart.ca/product_info.php?c...&products_id=9
(looks like a duffle bag) are good if you want to be discreet and offers some protection for your airsoft. A hard case is good for protecting the gun. garbage bags just make you look shady and neither protect nor hide the gun. The only place i'd consider using a garbage bag is on the inside of a case or protective bag to help water proof.