This bag is foil lined and heat sealable. The valves on these bags work really well to preserve freshness, since the CO2 from fresh coffee flushes the oxygen out of the one way de-gassing valve, and when you open the bag you can squeeze it while resealing and help force more oxygen out.
We also like how these bags are a blank canvas. They're pretty much begging to be personalized. Go ahead, make some custom labels, stamps, or even take a marker to some of these, and share your homeroast! This is your only chance to justify all that roast smoke you have generated all year long.
If you are shipping coffee, or storing darker roasts, we strongly suggest these over paper bags. Paper ones will, despite the liner, stain with coffee oils. These bags do WONDERS to preserve coffee aromatics! Valve bags are not good for storing ground coffee.
Please note that we offer bags for home roasters and do not fill orders for bags only, we are not a bag wholesaler...