An expandable ostomy pouch and an expandable ostomy cap include a first portion and a second portion sharing a common cavity. The first portion and the second portion are configured such that the second portion can be inverted and inserted within the first portion in a compacted state. The second portion can be manually pulled out or can be expanded due to gravity and/or due to elevated pressure within the pouch 10 due to the stomal discharge, as the cavity is filled with stomal discharge.