Hook-and-loop Velcro closure runs all the way across the open edge to keep the bag tightly sealed. Velcro has many advantages, including no moving parts, no metal pieces, no lead, easy to use, unbreakable, easy to clean, and helps keep foods fresh when tightly sealed.
USE WITH WET OR DRY FOODS: These bags are intended for use with food that you would typically wrap in plastic wrap or zip-lock bags. Not intended for liquids! Nylon lining provides a moisture barrier that helps keep foods fresh, but there could be passage of liquid through seams.