Openings specially adapted for bags in the nature of packaging containers for free-flowing, powdered, paste-like, gel-like or liquid material, namely, medical dispensers in the nature of attachable pour spouts, pour taps, dispensing pour valves; vacuum pumps, dispensing apparatus, namely, dispensing apparatus in the nature of attachable dispensing devices for use in the manufacture of aerosol dispensers for medical purposes, nebulizers, drippers for cannulae, cannulae, syringes and measuring ...