The present disclosure provides a port. In an embodiment, a port is provided and includes (i) an optional top portion, (ii) a base, and a channel extending through the optional top portion and the base for passage of a flowable material, and (iii) a septum extending across the channel. The septum comprises an ethylene/α-olefin multi-block copolymer.本發明提供一種端口。在一實施例中,提供一種端口且其包含(i)一視情況選用之頂部,(ii)一基座及一延伸穿過所述視情況選用之頂部及所述基座以便一可流動材料通過之通道,及(iii)一延伸穿過所述通道之隔膜。所述隔膜包括一乙烯/α-烯烴多嵌段共聚物。