I received a free kids Konserve lunch sack last year (read up here) and you can get another one this year.
This year is a little more involved than last year but still worth it because the lunch sack is so nice!
Here's the fine print
Free Reusable lunch sacks are available with four PROOFS OF PURCHASE, one from EACH of the following companies: Annie’s Homegrown (any item), Honest Kids Organic (8–pack carton or 64 oz bottle), Seventh Generation (Disinfectant Sprays and Wipes), AND Stonyfield YoKids (Organic Yogurt 6-pack or Squeezers).
Products must be purchased between July 1, 2011 and Sept 30, 2011. You must send in entry form, available www.annies.com/bts11, or 3x5 card with Name and Address along with the four required proofs of purchase in the form of an original receipt with products listed or UPC codes from each of the above qualifying packages, to: Annie's Lunch Sack, 1610 Fifth Street, Berkeley, CA 94710. Offer good in U.S only. Limit one lunch sack per household or address. Must be 18 years or older. Supplies are limited. Offer expires September 30, 2011 or while supplies last. Allow 8-10 weeks for delivery.\