If you aren't already carrying a tote then it is certainly time to invest. On the long journey of trying to abolish plastic bags, cotton bags are the way forward. You can throw this in your backpack ready for when you nip into the shops or you can use it as your primary bag. The Patagonia P-6 Market Tote Bag in Bleached Stone has been constructed from 100% organic cotton that is durable, sturdy and printed with PVC- and Phthalate-Free inks.