We're sorry to hear about your experience with Ziploc® Slider Bags. We expect each bag to block out air and lock in freshness. Typically this happens when air is able to reach the item – causing ice crystals to develop, especially on food high in moisture. As this didn't meet our standards, we'd like the chance to chat further. Give us a call at 1-800-558-5252 (weekdays, 8 a.m. – 5 p.m. CT) and mention reference number: 22815906. We look forward to assisting. – Megan, SC Johnson Consumer Care