A capsule for delivery of a composition, the capsule comprising: (a) a capsule shell comprising a water-soluble polymer and defining an interior capsule volume, wherein: - the capsule shell has a wall thickness of at least 500 μm, - the capsule shell comprises a pinhole sized and shaped: to permit gaseous fluid communication between the interior capsule volume and an environment external to the capsule shell, and to limit liquid fluid communication between the interior capsule volume and the external environment; - the capsule shell comprises two or more capsule shell elements mated together to collectively define the capsule shell and the interior capsule volume; - each capsule shell element comprises the water-soluble polymer; and - at least one capsule shell element comprises the pinhole; and (b) a composition contained in the interior capsule volume; wherein: the composition comprises a gas-emitting composition, and the interior capsule volume is free from water-sensitive compositions capable of generating gas when contacted with at least one of liquid water and water vapor, wherein the capsule shell has a wall thickness in a range of 500 μm to 5000 μm; or the water-soluble capsule shell comprises polyvinyl alcohol, and the composition is a volatile composition capable of emitting a volatile component of the volatile composition as a gas, wherein the capsule shell has a wall thickness in a range of 500 μm to 3000 μm; or the capsule is a delayed release capsule and the composition contained in the interior capsule volume is a composition intended for delayed release into an aqueous medium, wherein said composition comprises a cleaning composition and is other than a water-sensitive composition capable of generating gas when contacted with at least one of liquid water and water vapor, and wherein the capsule shell has a wall thickness in a range of 500 μm to 5000 μm. (a) a capsule shell comprising a water-soluble polymer and defining an interior capsule volume, wherein: - the capsule shell has a wall thickness of at least 500 μm, - the capsule shell comprises a pinhole sized and shaped: to permit gaseous fluid communication between the interior capsule volume and an environment external to the capsule shell, and to limit liquid fluid communication between the interior capsule volume and the external environment; - the capsule shell comprises two or more capsule shell elements mated together to collectively define the capsule shell and the interior capsule volume; - each capsule shell element comprises the water-soluble polymer; and - at least one capsule shell element comprises the pinhole; and - the capsule shell has a wall thickness of at least 500 μm, - the capsule shell comprises a pinhole sized and shaped: to permit gaseous fluid communication between the interior capsule volume and an environment external to the capsule shell, and to limit liquid fluid communication between the interior capsule volume and the external environment; - the capsule shell comprises two or more capsule shell elements mated together to collectively define the capsule shell and the interior capsule volume; - each capsule shell element comprises the water-soluble polymer; and - at least one capsule shell element comprises the pinhole; and (b) a composition contained in the interior capsule volume; wherein: the composition comprises a gas-emitting composition, and the interior capsule volume is free from water-sensitive compositions capable of generating gas when contacted with at least one of liquid water and water vapor, wherein the capsule shell has a wall thickness in a range of 500 μm to 5000 μm; or the water-soluble capsule shell comprises polyvinyl alcohol, and the composition is a volatile composition capable of emitting a volatile component of the volatile composition as a gas, wherein the capsule shell has a wall thickness in a range of 500 μm to 3000 μm; or the capsule is a delayed release capsule and the composition contained in the interior capsule volume is a composition intended for delayed release into an aqueous medium, wherein said composition comprises a cleaning composition and is other than a water-sensitive composition capable of generating gas when contacted with at least one of liquid water and water vapor, and wherein the capsule shell has a wall thickness in a range of 500 μm to 5000 μm. the composition comprises a gas-emitting composition, and the interior capsule volume is free from water-sensitive compositions capable of generating gas when contacted with at least one of liquid water and water vapor, wherein the capsule shell has a wall thickness in a range of 500 μm to 5000 μm; or the water-soluble capsule shell comprises polyvinyl alcohol, and the composition is a volatile composition capable of emitting a volatile component of the volatile composition as a gas, wherein the capsule shell has a wall thickness in a range of 500 μm to 3000 μm; or the capsule is a delayed release capsule and the composition contained in the interior capsule volume is a composition intended for delayed release into an aqueous medium, wherein said composition comprises a cleaning composition and is other than a water-sensitive composition capable of generating gas when contacted with at least one of liquid water and water vapor, and wherein the capsule shell has a wall thickness in a range of 500 μm to 5000 μm.