An ostomy appliance to provide continence to a stoma, comprising: a collapsed waste collection pouch for receiving stomal waste, and having a membranous body; said membranous body having: - an aperture attached to a proximal end of said ostomy appliance and sized to receive waste therefrom; - a closure region comprising a membrane surface extending substantially parallel and proximal to said aperture; wherein the membranous body of said collapsed waste collection pouch comprises a folded configuration having a polygonal cross-section perpendicular to a distal-proximal axis, wherein said polygonal cross-section comprises a shape formed by folds comprising a plurality of substantially parallel crease lines; a pouch restraint comprising a recess; wherein said polygonal cross-section is fitted to the shape of said recess in said pouch restraint; wherein the limits of said closure region are defined by the folds; said folds restrict waste reaching said aperture from moving past said closure region into the remainder of the pouch body, when attached as a collapsed waste collection pouch to said ostomy appliance; and wherein said interfering comprises a first fold being restrained from opening before a second fold opens, characterised in that the area of said polygonal cross-section is less than 25% of the enclosed area of the unfolded pouch, and in that said collapsed waste collection pouch is restrained from deployment by the folded structure of said pouch body interfering with its own opening. a collapsed waste collection pouch for receiving stomal waste, and having a membranous body; said membranous body having: - an aperture attached to a proximal end of said ostomy appliance and sized to receive waste therefrom; - a closure region comprising a membrane surface extending substantially parallel and proximal to said aperture; wherein the membranous body of said collapsed waste collection pouch comprises a folded configuration having a polygonal cross-section perpendicular to a distal-proximal axis, wherein said polygonal cross-section comprises a shape formed by folds comprising a plurality of substantially parallel crease lines; - an aperture attached to a proximal end of said ostomy appliance and sized to receive waste therefrom; - a closure region comprising a membrane surface extending substantially parallel and proximal to said aperture; wherein the membranous body of said collapsed waste collection pouch comprises a folded configuration having a polygonal cross-section perpendicular to a distal-proximal axis, wherein said polygonal cross-section comprises a shape formed by folds comprising a plurality of substantially parallel crease lines; wherein the membranous body of said collapsed waste collection pouch comprises a folded configuration having a polygonal cross-section perpendicular to a distal-proximal axis, wherein said polygonal cross-section comprises a shape formed by folds comprising a plurality of substantially parallel crease lines; a pouch restraint comprising a recess; wherein said polygonal cross-section is fitted to the shape of said recess in said pouch restraint; the limits of said closure region are defined by the folds; said folds restrict waste reaching said aperture from moving past said closure region into the remainder of the pouch body, when attached as a collapsed waste collection pouch to said ostomy appliance; and wherein said interfering comprises a first fold being restrained from opening before a second fold opens,