After trying to save a little money, I purchased bags from s well known outdoor retailer awhile ago. They had some type of interface that supposedly helped with liquid issues when one sealed juicy meat. WRONG. The interface stuck to the meat and even when thawed was difficult and time consuming to remove. Needless to say I went back to buying FoodSaver brand and won’t switch again. When they are on sale - especially with free shipping-you can’t beat the price.