the present invention provides a holder with a novel structure for retaining generally cylindrical objects , preferably paintball pods , within a retention tunnel or slot on a carrying harness . in particular , the retention tunnel is formed by a semi - rigid stabilizer plate that is secured by at least two of its edges to a smaller piece of elastic band . when that band is stretched and secured to the stabilizing plate , the plate is urged into a bent shape that forms an interior tunnel of elastic that becomes curved to form a saddle - shaped , hyperbolic , paraboloid that extends inwardly into the formed tunnel . the contours of this curved elastic within the retention tunnel provide a convenient and effective transverse elastic pressure that pushes against a pod inserted into the tunnel and holds it there until removed . this retention tunnel may then be attached to a back plate with its own waistband and / or mounted on an inner waistband that is overwrapped with the outer waistband for additional security . hook - and - loop fasteners are compatible with the durable synthetic fabric that are conventionally used for paintball harnesses and are preferably used liberally to provide multiple points of support about the user &# 39 ; s waist . preferably , the elastic band exhibits elasticity along a single , planar direction and is shorter in length along that stretch plane than the semi - rigid stabilizing plate . the stabilizing plate is the outer shell of each retention tunnel and should be sufficiently rigid to be self - supporting but should also allow bends without changing length or width dimensions . the stabilizing plate is also preferably made of a weather resistant fabric material that can be sewn together with the elastic band and , optionally , a back plate that carries the other retention tubes and any auxiliary elastic loops for added carrying capacity . the back plate is also desirably semi - rigid and should have sufficiently structural integrity and durability to hold one or more , preferably 3 - 6 , retention tunnels ( made of the stabilizing plate and stressed elastic band ) in place . this back plate also creates the floor of each retention tunnel and should permit some degree of bending to permit a generally cylindrical tube to be inserted into each retention tunnel . in making the retention tunnel according to the invention , the stabilizing plate and elastic band are positioned and sewed along one end that is transverse to the stretch plane of the elastic . the elastic is extended along its stretch plane and then sewed along this second end . if released , the elastic will contract and bend the stabilizing plate into an arc . in the preferred retention tunnel , the elastic band and stabilizing plate are sewn together along at least two , preferably at least three , and even more preferably along all four ends of the elastic band — two seams transverse to the stretch plane along each side of the tunnel and two seams substantially parallel to the stretch plane at the front and rear openings of the tunnel . the stressed elastic band assumes a generally saddle - shaped , hyperbolic paraboloid shape in which elastic under tension extends into the retention tunnel to provide the holding force on pods loaded therein . it will be understood that the elimination of a sewn seam may form a retention web having the shape of a partial hyperbolic paraboloid . using the present invention , users are able to load generally cylindrical round objects or sports balls . such objects include paintball pods , water bottles , sporting equipment , working tools , or other gear into the holding tunnel using only one hand . the holding tunnel will prevent the inserted item from falling out without utilizing holding straps that extend over the insertion opening and which would have to be removed before making an unobstructed opening for removal of the retained item . when removing the paintball pod , or other item requiring secure storage , the user simply pulls it out of the holding tunnel with one hand without the need to release any holding straps first . the present invention can be used in various areas of sport such as , for example , a water bottle and equipment holder . it could also be used in hunting or for military to secure and carry equipment , e . g ., flashlights , flares , lights and other such generally cylindrical objects without using any holding straps . the one - handed ease with which items can be inserted and removed saves time in critical situations . the present invention can hold bottles or containers of water and equipment for athletes such as long - distance runners , skiers , and climbers . it can also serve as a ball holder for sporting games such as golf and tennis . among other applications , the invention can be used by hunters or military personnel to provide secure storage with easy , quick access . it is convenient to describe the retention tunnels and associated harness with reference to their use in holding generally cylindrical paintball pod tubes having a closed end and an open end that is releasably closed with a frictional or locking lid . the retention tunnels can be attached to a wide variety of paintball pod carrying harnesses for use in a number of orientations , e . g ., top pull , side pull and vertical downward pull . plain elastic loops can also be attached to the tunnel support harness to provide additional pod carrying capacity , with the recognition that empty pods are not readily replaced into such elastic loops . preferably , the retention tunnels of the invention are oriented on the harness for a downward pull removal . preferably , the carry pack has two or more pod retention tunnels that are oriented vertically for a downward pull to release the retained pods . this means that loading the pods involves inserting each pod vertically and upwardly through the bottom opening and into the pod retention tunnel . as noted above , each retention tunnel is secured to the carry pack and indirectly via hook - and - loop system to an elastic waistband that is adjustably secured via another hook - and - loop connection . the retention tubes are dimensioned so that radial , transverse , frictional force from the interior wall of the retention tunnel wall on the outer wall of the inserted pod retains the pod within said carry pack . this allows the carry pack to avoid the use or need for restraining straps that would otherwise be needed in a conventional carry pack to cover the bottom openings of each retention tunnel and retain the inserted pod therein . the attached figures are conveniently used to describe preferred , exemplary , embodiments of the invention . similar structures will use the same reference numbers in the various figures . referring now to fig1 , an elastic band 1 having a stretch plane 2 is sewn near first end 3 of semi - rigid stabilizing plate 4 to secure elastic band 1 and stabilizing plate 4 together . stabilizing plate 4 preferably exhibits a length along stretch plane 4 that is longer than the resting , unstretched length of elastic band 1 . stitches 5 that secure the first end 6 of the elastic band to the first end 3 of stabilizing plate 4 preferably extend the length of elastic band 1 in a direction that is transverse to stretch plane 2 . this allows elastic band 1 to be stretched along stretch plane 2 and be secured , preferably with sewing stitches , along second end 7 of elastic band 1 and near second end 8 of stabilizing plate 4 . as shown in fig2 , if stabilizing plate 4 was released , the elastic tension would urge plate 4 into a bent or arcuate shape . such a shape and construction would be useful as a retention tunnel for a pod harness , but the preferred structure includes additional sewn seam connections 9 , 10 along the remaining edges of elastic band 1 and stabilizing plate 4 that will ultimately serve as the open ends of the retention tunnel . fig3 shows a retention tunnel 11 in which seam 10 is located in the front of tunnel 11 and seam 9 is at the rear . elastic band 1 is secured to stabilizing plate 4 along all four edges of elastic band 1 . elastic band 1 is under some curvature stress due to the attachments within the longer stabilizing plate 4 and thereby forms a configuration akin to that of a saddle - shaped , hyperbolic paraboloid ( see fig8 ). the elastic band 1 is under tension between the stabilizing plate sides and thereby creates the paraboloid having an elastic diameter which is smaller than a paintball pod . so when a paintball pod gets pushed in to the “ holding tunnel ” the elastic band 1 gets pushed up and to the sides . this creates an applied pressure on the short ends to hold the pod securely within the tunnel . fig4 and 5 depict a retention tunnel according to the invention and the insertion of a filled paintball pod 13 into the forward tunnel opening 14 . a plurality of such retention tunnels , e . g ., 3 - 6 tunnels , can be secured to a back plate and form a harness of the type shown in fig6 . as sketched in fig3 and 7 , retention tunnel 11 is secured to a back plate 12 . such back plates may be attached directly to one or more elastic straps 16 ( see fig6 ) that serve as an elastic waistband for the player or , as is more conventional , indirectly mounted on an inner elastic waistband 15 bearing hook - and - loop fasteners to secure the harness to the player . the elastic waistbands attached to the back plate can then be extended to overwrap the connection of the inner waistband 15 and form a second , outer , waistband that provides additional support for the harness when carrying a full complement of loaded pods 13 . fig7 further illustrates a cross sectional view of a retention tunnel 11 with the stressed and curved elastic band 1 in position within retention tunnel 11 formed within the curvature of stabilizing plate 4 . fig7 further shows elastic end straps 16 , 17 that can serve as a delimiting travel stop for pods 13 inserted into tunnel 11 . it is understood that the embodiments illustrated in the present invention are preferred and are not intended to serve as substantive limitations on the scope of the appended claims .
the present invention provides a strapless holder that securely supports a generally cylindrical object , such as a paintball pod , within the retention tunnel by an elastic band that is curved to form at least a portion of a saddle - shaped , hyperbolic , paraboloid within the retention tunnel . also provided is a method for using a retention strap - free holder for paintball pods for fast access to replenishment paintball pods .