When getting lunchboxes, should we take note of the materials used? eg. BPA-free etc?

Actually, BPA is safe in low amounts. I would still choose a BPA safe container as there isn't much difference in price. http://www.fda.gov/Food/IngredientsPackagingLabeling/FoodAdditivesIngredients/ucm355155.htm

Yes, it is safer to use BPA-free lunchbox in case you need to place hot food for your kid.

Yes I make sure all the plastic I buy for the kids is BPA free.

thanks