>> Sheryl Crow's designed a reusable tote bag for Whole Foods ! The bags (right), made from 80% post-consumer plastic bottles, will go on sale Oct. 15 for just 79 or 99 cents each, depending on the size. >> Of course, reusable bags aren't actually green unless you, you know, reuse them! If you've got all the reusable bags you need, don't take new ones even if they're being given away free. Stick with what you've got for the best enviro results: "If each bag is used multiple times -- at least once a week -- four or five reusable bags can replace 520 plastic bags a year, says Nick Sterling, research director at Natural Capitalism Solutions, a nonprofit focused on corporate sustainability issues." >> Still need more bags? Make your own tote -- from reclaimed fabric! Threadbanger shows you how via this cute instructional video: >> Got too many reusable bags already? Turn totes into messenger bags! On Flickr, duganj provides a photo-illustrated guide for this DIY project. Photo courtesy of Whole Foods ...