When you have a package to mail, use plastic bags in place of packing peanuts or bubble wrap. They&#39;re lightweight, free and easy for the recipient to recycle.Line small bathroom and office trash cans with plastic grocery bags. Save any oversized bags that you get for your kitchen trash can.Need to clean up after your pup? Stick a plastic grocery bag on your hand, and you have a glove that you can toss without worry. Works great for other messes, too.<p>Pull a few colorful bags out of your stash, and use them to wrap a gift. Real Simple has instructions:</p><ul><li><a href="http://www.realsimple.com/home-organizing/new-uses-for-old-things/10-smart-uses-old-plastic-bags-10000001097755/page7.html" data-component="link" data-source="inlineLink" data-type="externalLink" data-ordinal="1" rel="nofollow">Plastic Bag Gift Wrap</a></li></ul>Tie a grocery bag around each knee before you go out to work in the garden, and you&#39;ll avoid countless laundry stains.Carry a grocery bag with you every time you go for a walk, and pick up any trash that you come across.Libraries and thrift stores are usually thrilled to accept any extra bags that you have. Preschools and day care centers may also have use for them. Just ask, and you&#39;re sure to find someone that&#39;s happy to take them off your hands.Use them again the next time you shop, or drop them in the bag recycling bin at the entrance to the store.