Our mylar bags are metalized BOTH SIDES.. bags with one see-thru window side will not work! Dear HOTMAIL.com email users, for unknown reasons HOTMAIL deletes our auto-generated emails. YAHOO email sometimes as well. Kindly use another email domain if you want membership confirmation, order confirmation, or a tracking number (eg: gmail.com, etc). See black banner on website for all items shipping flat-rate of $4.99! Volume bag case discounts are realized by updating quantities in View Cart. Lots of thin-ply masquerading as full thickness, lower-quality, double-fold shipped bags out there..don't be fooled! Our bags are high-quality, full-ply thickness (each side), heat sealed to themselves won't melt to your hot iron goodness, custom wrapped, and never shipped double folded! How may we help serve your home food storage needs in these troubled times? Preparation brings real safety and peace, empower yourself!