To make your bags tamper-proof, you need to Heat Seal them after filling. You can order heat sealers from many places, especially online. We recommend a heat sealer with a temperature gauge you can set. If your heat sealer has one continuous temperature, it may melt the material.
We recommend sealing our bags between 120 and 130 degrees Celsius and hold on for 2 to 4 seconds.
A couple of heat sealer companies we can recommend are:
Contact: Wes Hoffman