Abstract: A closure having a base with a piercable part, defined by a sidewall extending transversally with respect to the base and a bottom thereby creating an indent therein, the sidewall and/or bottom provided with several lines of weakened material strength, wherein the lines divide the sidewall and/or bottom in several wedge formed parts.

Abstract: An assembly of a container and a closure, the assembly having an overpressure relief system, wherein the system has a fixation between the closure and a container, the fixation providing two positions in between which the closure is movable.

Abstract: An assembly of a container and a closure: the container having an outer shelf with a neck portion defining a first access opening and a flexible inner bag having a neck finish defining second access opening; the closure being fixed to the container, said closure having at least two access ports positioned in front of said access openings and; the assembly including a seal positioned between the closure and the container, wherein the seal has at least two distinct sealing members, one positioned between the closure and the neck portion, the other positioned between the closure and the neck finish.