Hi parents, how to pack formula milk for traveling to overseas for 6days? I'm thinking to pack in a snack zip lock, is it a good way?

If it's alot of powder required, you may want to consider buying a small tin of formula. Else you can pack into one time use individual pack. Works well for me when I used them for my formula. You can get it from this website. Credible seller. http://tlo.com.sg/collections/baby-one/products/baby-one-milk-powder-bags