These bags are extremely durable, They are made of strong Mylar! The bags have a zipper top and can be made tamper proof with a heat sealer. 

100 Silver/Clear Aluminum/Foil Pouches Mylar Zip Seal Bags

Good For Packaging:

Herbs, Pharmaceuticals, Drugs

Bags Are Made From:

Laminated Material - PET  VMPET + PE

Bag Features:

 Tamper Proof (Heat Seal-able) - Zipper Top - Tear Notch - Opaque Security

Additional Features:

Air Tight,Smell Proof, Light Resistant, Moisture Free  

Dimensions:

6" x 9.25" (Zipper on the 9.25" Side)
Gusset Width 2.33"

Thickness: 

6.7 Mil - Single Layer

OPEN SIDE:

TOP OPENING BAG