PROGRESS brings you the #1 HIGH QUALITY food grade Mylar bags available today 140 Micron thickness offers higher quality and smellproof ability to protect your items compared to the competitors 110-120 microns These bags by PROGRESS have an expandable bottom offering greater volume and the ability to display them upright SMELL and MOISTURE proof 140 micron thickness Expandable bottom capable of standing upright for display High end matte black finish Airtight ziplock top Heat sealable top Resealable Smell proof Moisture proof Great for storing Medicines Tons of food storage uses such as Coffee, Candy, Herbs, spices, etc. Great for household items like coins, stamps, nuts and bolts and other small hardware items Great for gift bags and treats at parties Available in 4X6 inch and 3X4 inch sizes