Abstract: A seal system usable to seal containers and other fluid components to allow fluid flow through the seal system in a first direction yet prevent fluid flow through the seal system in an opposite direction. The seal system is particularly useful for facilitating insertion of a tube, such as a straw, into a container to withdraw fluids yet prevent fluids from leaking from a container once the straw has been withdrawn. The seal system may be formed from a flange having an opening and attached to the opening of the container, and a tubular body extending from the flange into the container. The tubular body may be formed from a transition section attached to the flange and extending generally away from the flange, and a collapsed seal section attached to the transition section and extending from the transition section away from the flange.

Abstract: A seal system usable to seal containers and other fluid components to allow fluid flow through the seal system in a first direction yet prevent fluid flow through the seal system in an opposite direction. The seal system is particularly useful for facilitating insertion of a tube, such as a straw, into a container to withdraw fluids yet prevent fluids from leaking from a container once the straw has been withdrawn. The seal system may be formed from a flange having an opening and attached to the opening of the container, and a tubular body extending from the flange into the container. The tubular body may be formed from a transition section attached to the flange and extending generally away from the flange, and a collapsed seal section attached to the transition section and extending from the transition section away from the flange.