A perfect combination of mylar bags and matching oxygen absorbers, protect against moisture and oxygen damage;Heat and vacuum sealable, can even seal with a hot iron;These Dry-Packs mylar bags and Oxy-Sorb oxygen absorbers are perfect for long term food storage;These Dry-Packs bags are some of the industry best mylar bags available.;These 4.3 mil bags reflect light, prodvide a moisture and oxygen barrier and they are puncture and tear resistant