In embodiments, the invention is a novel hydration pack refill system that comprises a fluid bladder, a bag for carrying the fluid bladder, a bladder nozzle for refilling the fluid bladder, a clip for sealing the end of the bladder nozzle, and a refill port for accessing the bladder nozzle through the bag and methods for its use. The invention may further comprise a water tube and a mouthpiece to allow a user to drink from the fluid bladder while wearing the bag. In an embodiment, the invention may employ one or more locking devices for holding the clip in place. The invention may further employ mating pairs of seating connectors to provide a watertight seal to the closed bladder nozzle.

A portable hydration device for use with a portable hydration system is described. The portable hydration device comprises a housing having an inlet, configured to be in fluid communication with a reservoir of water, and an outlet configured to be in fluid communication with a mouthpiece; the housing defining a throughbore connecting the inlet and the outlet. The device also includes a receptacle configured to contain an additive and a selector. The selector is movable between an engaged position in which the selector is engaged with the receptacle and a disengaged position in which the selector is disengaged from the receptacle. In the engaged position the selector permits fluid communication between the receptacle and the throughbore and in the disengaged position the selector prevents fluid communication between the receptacle and the throughbore. The selector defines a throughbore, the selector throughbore being aligned with the housing throughbore in the engaged and the disengaged positions.

A portable hydration device for use with a portable hydration system is described. The portable hydration device comprises a housing having an inlet, configured to be in fluid communication with a reservoir of water, and an outlet configured to be in fluid communication with a mouthpiece; the housing defining a throughbore connecting the inlet and the outlet. The device also includes a receptacle configured to contain an additive and a selector. The selector is movable between an engaged position in which the selector is engaged with the receptacle and a disengaged position in which the selector is disengaged from the receptacle. In the engaged position the selector permits fluid communication between the receptacle and the throughbore and in the disengaged position the selector prevents fluid communication between the receptacle and the throughbore. The selector defines a throughbore, the selector throughbore being aligned with the housing throughbore in the engaged and the disengaged positions.

A collapsible cup has a tubular body having an upper end and a lower end, centered on an axis, and formed with a plurality of helicoidal ridge formations spaced angularly around the tubular body and each extending between the ends of the body. A floor of greater rigidity than the body closes the lower end of the body. A ring reinforces the upper end of the body. The body and ridges are formed of an elastically deformable synthetic resin such opposite angular twisting of the upper and lower ends axially compresses together the upper and lower ends and moves upper end down close to the lower end.

A collapsible cup has a tubular body having an upper end and a lower end, centered on an axis, and formed with a plurality of helicoidal ridge formations spaced angularly around the tubular body and each extending between the ends of the body. A floor of greater rigidity than the body closes the lower end of the body. A ring reinforces the upper end of the body. The body and ridges are formed of an elastically deformable synthetic resin such opposite angular twisting of the upper and lower ends axially compresses together the upper and lower ends and moves upper end down close to the lower end.

A neck pillow bladder assembly includes a neck pillow that is curved into a U-shape for positioning around a user's neck. A compartment is integrated into the neck pillow and a bladder is insertable into the compartment in the neck pillow. The bladder can be filled with a fluid beverage and a tube is fluidly attachable to the bladder to receive the fluid beverage. Additionally, the tube is exposed when the bladder is positioned in the compartment to facilitate a user to drink the liquid beverage from the tube. A mouthpiece is fluidly coupled to the tube for positioning in the user's mouth to facilitate the user to drink the liquid beverage from the mouthpiece.

A neck pillow bladder assembly includes a neck pillow that is curved into a U-shape for positioning around a user's neck. A compartment is integrated into the neck pillow and a bladder is insertable into the compartment in the neck pillow. The bladder can be filled with a fluid beverage and a tube is fluidly attachable to the bladder to receive the fluid beverage. Additionally, the tube is exposed when the bladder is positioned in the compartment to facilitate a user to drink the liquid beverage from the tube. A mouthpiece is fluidly coupled to the tube for positioning in the user's mouth to facilitate the user to drink the liquid beverage from the mouthpiece.

Disclosed are flexible fluid reservoirs including a front sheet and a back sheet, each comprising a four-layer insulated wall. The four-layer insulated wall includes an interior layer and an exterior layer, and a metallic film layer and an insulation layer disposed between the interior layer and the exterior layer where the metallic film layer is oriented toward the exterior layer and the insulation layer is oriented toward the interior layer. One or more of the interior or exterior layers can be a metallocene modified polyethylene film. The metallic film layer can be aluminum coated polyethylene terephthalate resin. The insulation layer can be a foam layer comprising closed cell polyethylene resin. The four-layer insulated wall can resist or limit temperature changes of a fluid disposed within the reservoir for a period of time. The insulated fluid reservoirs can include closure mechanisms for sealing an upper opening of the reservoir.

Disclosed fluid reservoirs include closure mechanisms for sealing an upper opening of the reservoir. The reservoir can have plates adjacent the upper opening. When the upper end of the reservoir is folded, the plates can be positioned on opposite sides, and a closure frame can be slid over the plates to pressure them together. The plates can have pins that engage with slots in the closure frame, and a separate closure lock can be slid over the end of the closure frame to prevent the pins from exiting the slots. The plates can also bias the opening open when the closure is not engaged. Also disclosed are flexible fluid reservoirs that include structural elements, such as baffles, that help retain a desired shape of the reservoir when filled or empty. Some baffles can be elastically deformable to allow flattening and expansion of the bladder while biasing toward a neutral position.

Disclosed fluid reservoirs include closure mechanisms for sealing an upper opening of the reservoir. The reservoir can have plates adjacent the upper opening. When the upper end of the reservoir is folded, the plates can be positioned on opposite sides, and a closure frame can be slid over the plates to pressure them together. The plates can have pins that engage with slots in the closure frame, and a separate closure lock can be slid over the end of the closure frame to prevent the pins from exiting the slots. The plates can also bias the opening open when the closure is not engaged. Also disclosed are flexible fluid reservoirs that include structural elements, such as baffles, that help retain a desired shape of the reservoir when filled or empty. Some baffles can be elastically deformable to allow flattening and expansion of the bladder while biasing toward a neutral position.