A closure for a spout of a thin-walled flexible package is provided. The closure has a cap having a cap wall having a cap axis extending between a cap lower end and a cap upper end, a tamper-evident seal, and a grip surface having an undulated grip surface edge having a succession of low sections and high sections, such that bulges and windows are formed on the grip surface. The windows are sufficiently wide circumferentially to contain the cap and the tamper-evident seal in width. The low section of the undulated grip surface edge is tangent inferiorly to an imaginary plane orthogonal to the cap axis, which axially delimits inferiorly at least one of the bulges. The imaginary plane is arranged axially below the cap lower end.

An exemplary enclosure including a resin injection-molded canister defining a top end, a bottom end and an intermediate body disposed therebetween. The enclosure, furthermore, includes a resin injection-molded fitment defining a base, a tamper-evident panel, and a neck disposed therebetween. The top end includes a rim having an inwardly facing mating surface and the base includes a rim having an outwardly facing mating surface. The canister and fitment are configured to be fused along the inwardly and outwardly facing mating surfaces subsequent to being filled with the consumer product. The tamper-evident panel is molded into the fitment during the injection molding process while the mating plane of the fitment and canister is located below the base of the fitment to optimize the opening of the canister for being filled with the consumer product.

A method of filling a container with a viscous content by providing a container that has an inner surface formed by using a thermoplastic resin and, specifically, an olefin resin, applying an edible oil or a liquid paraffin on the inner surface of the container to form an oil film thereon, and filling the container that has the oil film formed on the inner surface thereof with a viscous content that has a viscosity at 25 C. of not less than 100 mPa.Math.s.

Containers with closures are disclosed. A closure may include at least a polymer orifice reducer configured to be permanently secured to a rim of an opening of a container and a flexible tamper evident seal disposed on the topside of the orifice reducer. The flexible tamper evident seal, optionally foil, covers one or more openings in the orifice reducer. Processes for permanently securing a closure to a container, optionally by forming a heat seal between the orifice reducer and container rim, are also disclosed.

Tamper resistant systems and devices and methods of forming the same are disclosed. A tamper resistant system includes a container having a container body defining a cavity having a threaded opening therein, a threaded closure removably covering the threaded opening, and a frangible component including a length of material having a first end and a second end. The first end is integrated with the container body such that the frangible component and the container body have a single piece construction and the frangible component extends from the container body. The second end is coupled to the threaded closure. Subsequent removal of the threaded closure from the container causes damage to at least one of the frangible component, the threaded closure, and the container body. The frangible component, the threaded closure, and the container body are at least partially constructed of an environmentally friendly material.