No Leak Slide Seal Bags have a unique slide seal closure that helps to prevent leaks and works to keep the contents fresh. The new slide seal virtually eliminates leaks, so you can store contents with high moisture content without fear of leakage. The extraordinary seal can also help to increase the shelf life of the contents and reduce the risk of bacterial contamination. The bag is simple to use, thanks to a unique slider that 'locks' into place when fully closed so you know that the bag is sealed securely. The large slider mechanism is easy to grasp and use, even with gloved hands, and a white write-on block makes it easy to label or identify the bag contents, expiration or packed date. Child safety is designed into the bag, thanks to the over 5 pounds of force required to pull the slider off its tracks. Bags meet FDA requirements for use with food products. LDPE.