About.com have the instructions to make a reusable lunch sack.

Materials Needed:

• Approximately 3/8 yard of 45″ wide fashion fabric for the exterior of the bag
• Approximately 3/8 yard of 45″ wide fabric for the lining (I used a nylon wind breaker weight so that it could be sponged off)
• Batting – a thin but dense batting seems to work best
• Fusible Web
• 3″ piece of 3/4 to 1″ wide hook and loop tape
• Thread

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The Trolley Bag is made from heavy duty calico with handles manufactured from recycled plastic. It clips to the inside and outside of supermarket shopping trolleys, and, to make life easier at the checkout, it even clips effortlessly onto the checkout packing racks. The elastic sides ensure one size fits all trolleys and the handles clip securely together to ensure your shopping items do not spill. The Trolley Bag has been weight tested to 25kg so you are assured of its durability. This bag makes a great promotional tool.

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