Printed plastic bag with sturdy strap handle. The bag is made of multi-layer foil (higher strength). Retailers primarily of food products in retail stores pack their products in plastic bags. They can carry bulkier and heavier purchases, and can also be used for repeated packing. Compared to paper packaging, plastic bags have the additional advantage of being waterproof and greaseproof. Plastic bags also usually last longer than paper bags or sacks.