Get a load of these Tyvek Market Bags from Uncommon Goods.com (a BIG, BiG, BIG favorite of mine).
From the website:
We’ve all been there: rushing to work or home with a shopping bag full of food, clothes, magazines or whatever, and the bag bottoms out spilling its contents everywhere. Those irksome days can soon be over with these brilliant bags created by Marian Schoettle that have the design and look of an ordinary shopping bag but are made of ultra-durable Tyvek, a synthetic material made of high-density polyethylene fiber. Tyvek can not be easily ripped and is waterproof (the Post Office uses envelopes made of it) so these bags have the lightness of a paper bag with the strength of steel.
Part of the fun of these bags is that they are so unexpected; They look like they can rip at any moment and it is always surprising that they don’t. Since they pack flat and are so light, they are great for travel or for putting inside another bag. Their ability to hold so much weight makes them ideal for trips to the market, as carry-ons or everyday transportation of items. Plus, you can write or draw on them to personalize them. Available in large or medium in paper-bag brown or deep navy blue. Sold individually.
To take a closer look, click the link that’s about to throw itself in your cyber lap – Tyvek Market Bags