We LOVE the vacuum seal containers for storing fresh fruit, but they don't last.  We started with the round containers- worked well for a few months, then don't hold a seal.  The same for the square and oblong containers.  This new Preserve & Marinate containers have a nice indicator so you KNOW it is sealed.  You HEAR air escaping as you push the lid down, then turn the dial to Vacuum and remove air until the indicator pops down.  This keeps fresh cut strawberries and cantaloupe FRESH for more than a week!