TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Enclosure: The fluid enclosure further comprises an occluding/desorbing material; a metal hydride; and clathrate (preferably methane clathrate). The fluid enclosure further comprises at least one feature (106) positioned within the outer enclosure wall; at least one structural feature; and a fluid, in contact with the structural filler. The fluid enclosure comprises a cylindrical shape, a prismatic shape or a polyhedral shape or a tetrahedral shape. The fluid enclosure comprises an irregular shape adapted to fit an allotted space. The fluid enclosure further comprises at least one sealing layer conformably coupled to the outer enclosure wall; at least one sealing layer conformably coupled to the structural filler, where the at least one sealing layer contains a metallic layer (preferably an aluminum layer). The fluid enclosure comprises a volume of less than 1000 (preferably less than 10, more preferably less than about 5, especially less than 2, particularly less than 1) cubic centimeter. Preferred Components: The structural filler comprises a metallic or plastic lattice, composite hydrogen storage material, nano-structured carbon foam, aerogel, zeolite, silica, alumina, graphite, activated carbon, micro-ceramic, nano-ceramic, boron nitride nanotube, borohydride powder and/or palladium-containing material (preferably a composite hydrogen storage material or a lattice including pores). The composite hydrogen storage material comprises a metal hydride. The pores support an occluding/desorbing material. The structural filler comprises occluding/desorbing material or a metal hydride. The structural filler comprises a continuous, uniform thickness throughout the fluid enclosure; or a non-uniform thickness throughout the fluid enclosure. The fluid comprises a gas, a liquefied gas, and/or liquid (preferably a gas). Preferred Method: The manufacturing method further involves before conformably coupling, coupling at least one feature to the structural filler or the outer enclosure wall; after conformably coupling, coupling at least one feature to the structural filler and/or the outer enclosure. The step of conformably coupling the outer enclosure wall to the structural filler includes spraying, painting, dip coating, inset molding, electrostatic deposition, compression molding, transfer molding, injection molding, thermoset injection molding, vacuum forming, sintering, extrusion, pultrusion, thermoforming, vacuum over-molding, powder coating, and/or solution casting (preferably dip coating). The manufacturing method further involves after conformably coupling, forming at least one sealing layer; and before coupling, forming at least one feature. The method (M1) further involves after contacting, releasing the fluid from the fluid enclosure; after releasing the fluid, contacting and releasing the fluid multiple times (preferably at least 3 times, more preferably at least 50 times, especially at least 300 times, particularly at least 10000 times). The method (M2) further involves after releasing, contacting the fluid enclosure with a fluid; after contacting the fluid enclosure, releasing and contacting the fluid enclosure multiple times (preferably at least 3 times, more preferably at least 50 times, especially at least 500 times, particularly at least 10000 times).    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The external device comprises a fuel cell, a heat pump, a hydrogen compressor or an air conditioner (preferably a fuel cell). The fuel cell is further coupled to an electronic device (preferably cellular phone, satellite phone, personal digital assistant (PDA), laptop computer, ultra mobile personal computer, computer accessory, display, personal audio or video player, medical device, television, transmitter, receiver, lighting device, flashlight, battery charger, portable power source or electronic toy). Preferred System: The fluid enclosure system comprises a volume of less than 1000 (preferably less than 120, more preferably less than 25, especially less than 15, particularly less than 5) cubic centimeters.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The outer enclosure wall comprises a polymer (preferably polypropylene, vinylidiene fluoride hexafluoropropylene copolymer, polyethylene, polyvinylidene fluoride (PVDF), hexafluoropropylene vinylidene fluoride copolymer, cross-linked copolymers, polytetrafluoroethylene (PTFE), perfluoro alkoxy (PFA), polyimides, polyamides, polyether ether ketone (PEEK), Ultem (RTM: polyetherimide) and/or Nylon (RTM: thermoplastic polymers, especially vinylidiene fluoride hexafluoropropylene copolymer). The outer enclosure wall comprises the same material as at least a portion of the structural filler; and multiple layers. The multiple layers are comprised of the same material. The outer enclosure wall has an average thickness of less than 5000 (preferably less than 1500, more preferably less than 500, especially less than 100, particularly less than 1) microns. The at least one feature is a valve, a regulator, a vent, a cap, a pressure relief device and/or flow element. The at least one structural feature is a boss, a mounting flange, a fastener, a fitting, a concave recess, a radiused corner and/or convex protrusion (preferably a concave recess or a convex protrusion). EXAMPLE - Wafers of a structural filler made from a composite hydrogen storage material were formed by heat and pressure sintering as detailed in US11379970 with densities of 5-6.1 g/cc. The wafers with densities of 5-5.5 g/cc included about 6 wt.% of Kynar Flex 2851 (RTM: vinylidiene fluoride hexafluoropropylene copolymer as a binder). Wafers with densities of 5.5-6.1 g/cc included 4 wt.% of Kynar Flex 2851 as a binder. The wafers were free of dust and were free of surface roughness features exceeding 50 microns. Components were attached using a Kynar Flex interface. A solvent solution of 40-80 g/l of Kynar Flex 2751 (RTM: vinylidiene fluoride hexafluoropropylene copolymer) was used as a glue for connecting the components to the enclosure. A fluid port or opening was fitted with a 2-micron filter and a small hole (about 0.8 micron) was drilled into the wafer (about 7 microns) to facilitate fluid diffusion into and out of the enclosure. Kynar Flex 2851 dissolved in acetone was applied as a coating in multiple layers. The first layer was applied by dipping a wafer into a solution of about 40 g/l Kynar Flex 2851 dissolved in acetone. The solution then penetrated the surface pores of the wafer. Subsequent layers were painted on using 80 g/l Kynar Flex 2851 in acetone and were allowed to fully dry between applications. A total of 20-30 mg/cm2 of coating was disposed uniformly on the wafer. After drying, the remaining coating (outer enclosure wall) was 100-150 microns thick. The fluid enclosure thus formed was then sintered at 190degrees C for 20 minutes.