vacuum packaged items can cause small holes to be poked into your bags, leading to air penetration and freezer burn. protect your bags from sharp objects in the freezer and move them around with care. if you notice loose packages, be sure to remove the food and re-seal promptly.
vacuum packaging will often cause red meat to turn a shade of brown. this is caused by the lack of oxygen which is removed from bags by the vacuum packaging process. this change causes no harm to the meat, it's flavor or texture. it does not make it unsafe to eat. 