I've never had any problems boiling the bags, always make sure I use a large enough pot to minimize contact with the metal. From FoodSaver.com -
FoodSaver Bags have a design so unique it’s been patented. Special channels enable the efficient and complete removal of air so none is left trapped in “pockets” around the food. Their 5-ply construction makes them an especially effective barrier to oxygen and moisture. FoodSaver Bags are safe to freeze, boil or microwave, and proven to prevent freezer burn.