in one embodiment , the hull is comprised of a synthetic foam such as polyurethane foams polyethylene foams or other synthetic foams . in one embodiment , the hull comprises a foam in the class known as cross - linked polyethylene foams , such as chemically - cross - linked polyethylene foams . some other preferred hull materials are polyurethane compositions comprising in the range of from about 90 to 99 wt % synthetic urethane polymer ( cas 59676 - 67 - 1 ), and in the range of from about 1 to 10 wt % diphenylmethane diisocyanate . a preferred composition comprises in the range of from about 94 to 96 wt % synthetic urethane polymer and 4 to 6 wt % diphenylmethane diisocyanate . however , other synthetic materials can be used as long as they are buoyant and float at or above the water surface when bearing their intended load . one advantage of the present invention is that some of the preferred materials , for example , synthetic urethane polymer containing diphenylmethane diisocyanate , swell to a degree in salt and fresh water , during at least the initial hour of so of exposure , such that the cavities retain their contents with increasing tightness . in a preferred embodiment , the foam hull is encased on the bottom and sides in a material , such as an epoxy , which , in some embodiments , acts to partially or fully constrain the water - induced expansion of the hull . in such embodiments , the narrowing of the cavities caused by the swelling of the hull can be exacerbated . in one embodiment , the coating has tabs which can be pulled such that the coating separates from the hull , which can facilitate extraction of bottles from the hull . in a preferred embodiment , the coating is a color which can be seen from a distance , such as , for example , hunter &# 39 ; s orange , or international orange . in some embodiments , the coating is fluorescent or phosphorescent . in different embodiments , the coating material covers the entire hull except for the openings to the cavities ; the coating covers the top surface only to the extent that it stops at the edges of a figure defined by the containers , shown in fig1 a . in another embodiment , the bottom surface is uncoated . it should be noted that allowing parts of the upper surface to remain uncoated increases the rate of absorption of water , and concomitant cavity tightening . in one preferred embodiment , the hull is fashioned of a polyurethane composition and is a parallelepiped in shape , having square upper and lower surfaces , with all vertices being right angles . preferably , the upper square surface has cavities which can grippingly receive the bases of standard 8 ounce bottles of liquid . in one embodiment , the cavities are circular cylinders having diameters of approximately 2 and ⅜ inches , arranged in a regular square grid , and the thickness of the hull is in the range of from about 5 to about 2 inches , and in a preferred embodiment , about 3 inches . the cylindrical cavities have depths in the range of from about 2 to about 4 inches . with at least 0 . 25 inches of material at the bottom of the cavity to adequately support the bottled liquid . a preferred depth is 2 . 5 inches , shown in fig1 b . in other embodiments , the holes extend through the hull , such that the bottled liquids are held securely , but protrude from the bottom of the hull . in general , regardless of the size receptacles to be inserted into the hull , it is preferred that the cavities or holes are sized such that they grippingly receive the bases of the receptacles . in a preferred embodiment , the cavities in the hull have a dry diameter of about 2 and ⅜ inches , and the hull grippingly receives at least one type of standard eight ounce bottle . in a preferred embodiment , the present invention comprises a tether which is attached to the hull . the tether can be of any strong cord , such as natural or synthetic multi - ply or woven cords . it is preferably a light color , and in some embodiments , is fluorescent or phosphorescent . it can be attached by means known in the art which withstand marine or freshwater conditions , at least for a length of time which coincides with human survivability adrift , and preferably indefinitely . the present invention has the ability to secure a water or other hydration supply in the event a boater or other water passenger becomes adrift at sea . it can float upright indefinitely ( fig2 ). in turbulent conditions , the hydration cargo is held securely ( fig3 ). upon inverting , the containers generally stay within their cavities ( fig4 ), and the exposure of the area surrounding the upper edge of the cavities to water can increase the grip of the hull on the hydration cargo . in another embodiment the invention comprises a hull which is suitable for towing by waders or others who harvest sea life in relatively shallow water . referring to fig5 , the hull additionally comprises a cut out ( 10 ), preferably encompassing the intersection of the long and short axes of the hull . the cut out is preferably discoid and passes entirely through the thin dimension of the hull ( 20 ), and in preferable embodiments , has substantially equal areas on either side of the long axis . the cutout has suspended through it a hamper for depositing fish , crabs , etc that are harvested by the wader . see fig6 and 7 in which an exemplary netted enclosure is displayed ( 30 ), undeployed , atop a hull corresponding to the recreational embodiment . in operation , the netted enclosure is suspended through a cut out ( not shown ) which is under the netted enclosure . the net is suspended through the opening . in some embodiments , the means is a rigid hoop ( 40 ) which is larger in diameter than the cutout . the animals are thus kept in an environment identical to their own which will not fluctuate with respect to critical values , such as dissolved oxygen content , temperature , ph , all of which are known to swing wildly in value when animals are introduced into a closed environment : ph decreases with the production of carbon dioxide , dissolved oxygen content falls with time , temperature can climb or fall over short periods of time if a closed container is left in the sun , or shade , respectively . nitrates and ammonia content increase as fish and crustaceans excrete nitrogenous wastes , which also affects ph , etc . in one embodiment , the hamper is a netted bag which trails into the water below the hull , comprising a draw string or other means of closure . in one embodiment , the drawstring pulls shut the net bag at a height which is below the bottom of the hull . in another embodiment , the drawstring pulls the bag shut at a point on the bag which is above the hull . in another embodiment , the bag is closed by an elastic strip which gathers the mouth of the bag together , such that the harvested animals cannot escape . referring to an exemplary embodiment of the recreational hull , fig5 , the hull can be in the range of from about 12 to about 60 inches in length ( 50 ) and 12 to 60 inches wide ( 60 ). a suitable thickness ( 70 ) is in the range of from about 2 inches to about 6 inches . the cut - out preferably has a diameter in the range of from about 8 to 20 inches . it is preferred that the cut - out be centered at a point along the long axis of the hull . in some embodiments , the cut - out is not discoid , but has a shape which is longer along one axis than another . for example , the cut - out may have an oval shape , such that it is narrower along one axis than it is along the perpendicular axis . such a case is appropriate for fish and crustaceans which are predisposed to leap from the net enclosure . in one embodiment , the net enclosure extends laterally under the hull to such a degree that the animals in the enclosure can benefit from large amounts of swimming space during the period of wading , yet they are prevented from leaping from the net enclosure due to the narrowed cut - out in the hull . if the cut - out has one dimension which is longer than the other , it is preferred that the long dimension of the cut - out be along the long dimension of the hull . because the hull can have the capacity to keep afloat at least 100 pounds of gear and supplies , it is preferred that “ corners ” in the cut out , such as might appear in the case of an oval of polygonal cutout be rounded out to prevent stresses which could propagate a split into the body of the hull due to the weight on the upper surface of the hull . the hull preferably has a forward portion which has a symmetric angular bow . for example , an angularly bowed front as in fig5 . in one embodiment , the corners at which the bowed section begins are rounded ( not shown ) for easier turning and aerodynamics . in another embodiment , the bowing is essentially angular , having an internal angle with the adjacent side of the hull in the range of from about 110 degrees to about 150 degrees . in a preferred embodiment , the internal angle is about 135 degrees . in a preferred embodiment , the forward most part of the bow , when viewed from above , is perpendicular to the sides of the hull . one advantage of the present design is that the hull can be fabricated from a single piece of foam substrate . the foam substrates discussed herein are generally conveniently available in pieces of uniform thickness . when viewed from the side , in one embodiment , the hull is preferably of uniform thickness throughout . however , it may be desirable to have a variable thickness . for example , if the hull is intended to bear large loads , such as , for example , 100 pounds or more , it may be desirable to have reinforcement thickness at areas in which load bearing increases chance of splitting . for example , it may be desirable that the hull be thickened at the edges to prevent buckling and splitting due to uneven distribution of load weight . in another embodiment , it may be desirable to have a hull which is thickened around the cutout because it could be expected that weight piled along the long axis of the hull would increase the likelihood of buckling and , possibly , splitting at the front and rear edges of the cutout . this would particularly be true if the cutout were oblong , with its long axis along the long axis of the hull . as with the lifesaving embodiment elucidated above , the present embodiment can also port bottled water or other fluids to prevent dehydration . as with the lifesaving embodiment , in a preferred embodiment , the bases of the water bottles are installed into cavities , ( 80 ) which are illustrated in fig5 adjacent the cut - out . the sockets can be at other places on the hull , such as , for example , the rear of the hull , the front or the hull , or both . it is preferred but not essential that the sockets be positioned symmetrically with respect to the upper surface of the hull , such as illustrated in fig5 . as it could be expected that very rough surf or other extreme conditions could overturn the hull and scatter the water supply , one preferred embodiment comprises a hull comprising a polymer foam such as those mentioned above in connection with the lifesaving embodiment , in which exposure to water causes a slight swelling of the foam , which improves the grip of the socket upon the base of the bottle . the size of the socket required for a given size of bottled liquid can be easily gauged by conducting routine testing : preparing sockets of varying depths and widths and measuring the difference between the pre - and post - wetting force required to extract the bottle from the socket . in a further embodiment , the hull is partially or fully coated or enrobed in epoxy or other material which can partially or fully constrain the swelling of the hull material . in a further embodiment , the hull is selectively coated such that the swelling is maximized at the uncoated surfaces , such as , for example , the inner walls of the sockets which contact the bottled water or other liquid . it has been found that in both the lifesaving and wade fishing embodiments of the present invention , selectively applying a coating which dries to form a rigid layer , such as epoxy , increases the ability of the sockets to retain its contents . thus , the hull can overturn and the contents of the sockets will remain consolidated in their sockets , available for use at will . in preferred embodiments , the front , bowed edge of the hull is beveled underward at an angle in the range of from about 85 degrees to about 60 degrees ( 90 ). preferred is an angle in the range of from about 80 degrees to about 70 degrees . an angle of 76 degrees is illustrated . in a preferred embodiment , the wade fishing embodiment or the life - saving embodiment comprises a series of holes ( 100 ) around the perimeter of the hull , located in its upper surface , and penetrating through to its lower surface . a lightweight synthetic or natural line or rope can be strung through the holes around the perimeter of the hull . for example , the pattern of holes in fig5 which are arranged in pairs , can be appropriately strung around the perimeter of the hull such that the rope passes on the underside of the hull between close holes of each pair , but on the upper side of the hull from the hole of one pair to the adjacent hole of the adjacent pair . at the apex of the bowed front , it is preferable to have a single hole ( 110 ), through which is threaded upward , a piece of rope to act as a tether . surprisingly , the combination of the bevel and the upwardly threaded tether reduces the tendency of the hull to pull through waves . rather , the hull is easily pulled over waves , keeping the tackle and other gear loaded onto the hull relatively dry . in other embodiments , the hull is sturdy enough to mount rod holders ( 120 ), such as the kind available from white cap industries in new jersey . for the purposes of promoting an understanding of the principles of the invention , specific embodiments have been described . it should nevertheless be understood that the description is intended to be illustrative and not restrictive in character , and that no limitation of the scope of the invention is intended . any alterations and further modifications in the described components , elements , processes , or devices , and any further applications of the principles of the invention as described herein , are contemplated as would normally occur to one skilled in the art to which the invention relates .
a recreational and / or lifesaving device comprising a floating foam hull comprising cavities a which securely retain stores of bottled water easily for consumption over time , preventing dehydration of a person adrift . in another embodiment , the hull comprises at least one cut - out , which can be used by a wading fisherman to humanely store catch items alive .