Instead of using disposable plastic ziploc bags that leach chemicals and last forever in the landfill, consider switching to an eco-lunch for yourself and your children! This is what an ecodeaf reader uses for herself and her family- Lunch bag made from recycled plastic bottles, aluminum boxes for meals such as pasta, etc. Aluminum bottle for water (avoid plastic containers or juice boxes!). Cloth napkins and cloth placemats, washable and use again, and again! Lunch skins for PBJs and carrots or grapes.
Why not juice boxes? Many of them, even organic ones, contain sugar which you or your children do not need. Water is the best! Let them eat whole fruits instead of juice.