Ostomy bags

An ostomy bag comprising two walls which are joined together along a seam around the edge of the bag, one of said two walls being easily accessible to the user when the bag is in use as it will face away from the user's skin, the accessible wall including a closable exit aperture and a closure, which releasably covers the aperture for selectively releasing accumulated gas through the aperture, the closure being provided in the form of a sealing flap, which attaches to the bag by means of a reusable seal, and which folds down from a hinge formed along the line of the seam, the hinge being formed by a section of the seam which is substantially straight, the sealing flap being substantially triangular and wherein the hinge defines one edge of the triangle, the inner and outer pouch walls extending beyond the seam to provide the flap, including a portion of the inner wall and a portion of the outer wall of the pouch, wherein the flap comprises a disc which is covered by a reusable adhesive, such that the flap is configured to be repeatedly peeled away and re-secured to the outer wall of the pouch, thereby covering the exit aperture;

• wherein the flap and exit aperture are configured to release gas from the pouch when the flap is stored away from the exit aperture;
• and wherein the flap and exit aperture are configured to prevent the release of gas from the pouch when the flap is re-secured to the outer wall of the pouch.