The only instant sealing sterilization pouches with steam and E.O. gas indicators inside and outside. Chex-All II pouches have indicator imprints on both the inside and outside. This unique feature monitors the effective penetration of steam or ethylene oxide gas on the inside of the package. Chex-All II pouches do not require heat sealers. The self-sealing feature eliminates the need for expensive and troublesome heat sealing machines, yet provides a seal as effective in maintaining sterility as any heat seal. It is also tamperproof.