主权项 |
1. An expandable food preservation and storage bag, comprising:
a first and second sidewall having a first thickness and a first oxygen transmission rate; a first gusseted sidewall having a second thickness less than the first thickness and a second oxygen transmission rate substantially equal to or less than the first oxygen transmission rate, said first gusseted sidewall interconnecting one side of the first and second sidewalls; and a second gusseted sidewall having the second thickness and the second oxygen transmission rate, said second gusseted sidewall interconnecting an opposite side of the first and second sidewalls. |