A portable apparatus for oxygen delivery includes a receptacle, a mouthpiece and a tube. In another aspect the mouthpiece includes a first fluid channel for a first fluid and a second fluid channel for a second fluid that is different from the first fluid. In a further aspect, the portable apparatus includes a receptacle, a mouthpiece and a tube in which the mouthpiece includes a teeth engagement portion, a lip engagement portion and a lip protection portion.

A tank for pressurized flammable gas, such as hydrogen, comprising at least one primary cylinder of pressurized flammable gas and at least one secondary cylinder of pressurized extinguishing gas. The at least one primary cylinder is individually equipped with a safety device that is capable of automatically releasing the flammable gas contained in said at least one primary cylinder toward the open air in the event of detection of an overheating situation of the at least one primary cylinder. The at least one secondary cylinder of pressurized extinguishing gas is fluidically connected with each safety device, and the safety device is configured to release extinguishing gas simultaneously with a release of flammable gas.

A portable apparatus for oxygen delivery includes a receptacle, a mouthpiece and a tube. In another aspect the mouthpiece includes a first fluid channel for a first fluid and a second fluid channel for a second fluid that is different from the first fluid. In a further aspect, the portable apparatus includes a receptacle, a mouthpiece and a tube in which the mouthpiece includes a teeth engagement portion, a lip engagement portion and a lip protection portion.