A device for electrical stimulation of a user, the device comprising: an electrode attached to a first side of a garment, wherein a surface of the electrode is configured to be placed in contact with a portion of a user's skin when the garment is worn by the user; and a gel or liquid dispensing system attached to the garment and configured to be actuatable to dispense a gel or liquid onto the surface of the electrode, the dispensing system comprising a reservoir configured to receive a pre-filled packet of gel or liquid, the packet comprising an outlet port, the reservoir comprising: a base portion, a movable portion attached to the base portion by a hinge and configured to move between an open position and a closed position, in the closed position the movable portion and the base portion defining an interior volume, a port in the interior volume and configured to mate with the corresponding outlet port of the packet, wherein the movable portion includes a pressure deformable surface, and wherein the dispensing system is configured to be actuated by applying pressure to the deformable surface, and a fluid passageway extending from the reservoir to the surface of the electrode, the fluid passageway configured to deliver the gel or liquid from the reservoir to the surface of the electrode when the dispensing system is actuated. an electrode attached to a first side of a garment, wherein a surface of the electrode is configured to be placed in contact with a portion of a user's skin when the garment is worn by the user; and a gel or liquid dispensing system attached to the garment and configured to be actuatable to dispense a gel or liquid onto the surface of the electrode, the dispensing system comprising a reservoir configured to receive a pre-filled packet of gel or liquid, the packet comprising an outlet port, the reservoir comprising: a base portion, a movable portion attached to the base portion by a hinge and configured to move between an open position and a closed position, in the closed position the movable portion and the base portion defining an interior volume, a port in the interior volume and configured to mate with the corresponding outlet port of the packet, wherein the movable portion includes a pressure deformable surface, and wherein the dispensing system is configured to be actuated by applying pressure to the deformable surface, and a fluid passageway extending from the reservoir to the surface of the electrode, the fluid passageway configured to deliver the gel or liquid from the reservoir to the surface of the electrode when the dispensing system is actuated. a base portion, a movable portion attached to the base portion by a hinge and configured to move between an open position and a closed position, in the closed position the movable portion and the base portion defining an interior volume, a port in the interior volume and configured to mate with the corresponding outlet port of the packet, wherein the movable portion includes a pressure deformable surface, and wherein the dispensing system is configured to be actuated by applying pressure to the deformable surface, and a fluid passageway extending from the reservoir to the surface of the electrode, the fluid passageway configured to deliver the gel or liquid from the reservoir to the surface of the electrode when the dispensing system is actuated.