Shopper bags and shopping trolleys are a practical addition to your supermarket run. Designs in soft fabrics like cotton and canvas can be folded up when not in use, and those in charming patterns brighten up running errands. Look out for sturdy over-the-shoulder straps. A style with wheels comes into its own if you need to transport a heavier load. Models made from waterproof materials will help keep groceries dry, and some have handy drawstring or zip fastenings.