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A weight system for supporting a free-standing object comprising first and second upper panels, a least one side panel, a lower panel, and a closure system. The panels are joined to define an upper wall and at least side wall, with the first and second upper panels defining a fill opening in the upp

A weight system for supporting a free-standing object comprising first and second upper panels, a least one side panel, a lower panel, and a closure system. The panels are joined to define an upper wall and at least side wall, with the first and second upper panels defining a fill opening in the upper wall and a container defining an interior chamber. The closure system is arranged to allow the container to be configured in a closed configuration in which access to the interior chamber through the fill opening is substantially prevented and an open configuration in which access to the interior chamber through the fill opening is allowed.

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1. A weight system for supporting a free-standing object, comprising: at least one side wall;a lower wall;an upper wall comprising first and second upper panels configured to define an overlap region in which a portion of the first upper panel extends over a portion of the second upper panel such th

1. A weight system for supporting a free-standing object, comprising: at least one side wall;a lower wall;an upper wall comprising first and second upper panels configured to define an overlap region in which a portion of the first upper panel extends over a portion of the second upper panel such that a fill opening is defined between the first and second upper panels within the overlap region; anda closure system comprising first and second closure panels, where the first closure panel is secured to the first upper panel on an upper side of the fill opening, andthe second closure panel is secured to the second upper panel on a lower side of the fill opening; whereinthe upper wall, the at least one side wall, and the lower wall are joined to form a container defining an interior chamber;the closure system is arranged to allow the container to be configured in a closed configuration in which the first closure panel engages the second closure panel substantially to secure the first upper panel relative to the second upper panel and thus prevent access to the interior chamber through the fill opening, andan open configuration in which the first closure panel is disengaged from the second closure panel to allow movement of the first upper panel relative to the second upper panel and thus allow access to the interior chamber through the fill opening. 2. A weight system as recited in claim 1, in which at least a portion of the first upper panel is lifted relative to the second upper panel to configure the container in the open configuration. 3. A weight system as recited in claim 1, in which: one of the first and second closure panels is a hook panel; andone of the first and second closure panels is a loop panel that is detachably attachable the hook panel. 4. A weight system as recited in claim 1, further comprising a joining system configured to allow at least a portion of the container to be secured relative to the free-standing object. 5. A weight system for supporting a free-standing object, comprising: a first container comprising at least one first side wall;a first lower wall joined to the first side wall;a first upper wall comprising first and second upper wall panels joined to the at least one side wall such that the first upper wall panel overlies the second upper wall panel to define a first overlap region, where a first fill opening is defined by the first and second upper wall panels within the first overlap region; anda first closure system comprising a first closure panel secured to the first upper wall panel within the first overlap region, anda second closure panel secured to the second upper wall panel within the first overlap region;a second container comprising at least one second side wall;a second lower wall joined to the at least one second side wall;a second upper wall comprising third and fourth upper wall panels joined to the at least one side wall such that the third upper wall panel overlies the fourth upper wall panel to define a second overlap region, where a second fill opening is defined by the third and fourth upper wall panels within the second overlap region; anda second closure system comprising a third closure panel secured to the third upper wall panel within the second overlap region, anda fourth closure panel secured to the fourth upper wall panel within the second overlap region; whereinthe first and second containers are detachably attached to each other to apply a force to at least a portion of the free-standing object. 6. A weight system as recited in claim 5, further comprising fill material, in which: with the first and second containers in open configurations, the fill material is arranged within first and second interior chambers defined by the first and second containers, respectively, through the fill openings of the first and second containers; andwith the fill material within the first and second interior chambers and the first and second containers in closed configurations, the first and second containers may be arranged to apply a force to at least a portion of the free-standing object. 7. A weight system as recited in claim 6, further comprising a joining system for joining the first and second containers together. 8. A weight system as recited in claim 5, in which at least a portion of each of the first and second containers is arranged to exert a force directly on at least a portion of the free-standing object. 9. A weight system as recited in claim 5, in which: at least a portion of the first container is in contact with the free-standing object and is arranged to exert a force directly on at least a portion of the free-standing object; andat least a portion of the second container is in contact with the first container and is arranged to exert a force on at least a portion of the free-standing object through the first container. 10. A weight system for supporting a free-standing object, comprising: at least one side wall;a lower wall;first and second upper panels configured to overlap to define an upper wall and a fill opening in the upper wall; anda closure system comprising first and second closure panels, where the first closure panel is secured to the first upper panel on an upper side of the fill opening, andthe second closure panel is secured to the second upper panel on a lower side of the fill opening; whereinthe upper wall, the at least one side wall, and the lower wall form a container defining an interior chamber; andthe closure system is arranged to allow the container to be configured in a closed configuration in which the first closure panel engages the second closure panel substantially to secure the first upper panel relative to the second upper panel and thus prevent access to the interior chamber through the fill opening, andan open configuration in which the first closure panel is disengaged from the second closure panel to allow movement of the first upper panel relative to the second upper panel and thus allow access to the interior chamber through the fill opening. 11. A weight system as recited in claim 10, in which: the first and second upper panels are sized and dimensioned to define an overlap region in which the first and second upper panels overlap; andthe closure system secures the first and second upper panels together within the overlap region when the container is in the closed configuration. 12. A weight system as recited in claim 11, in which the closure system comprises: one of the first and second closure panels is a hook panel; andone of the first and second closure panels is a loop panel that is detachably attachable the hook panel. 13. A weight system as recited in claim 10, further comprising a joining system configured to allow at least a portion of the container to be secured relative to the free-standing object. 14. A weight system as recited in claim 13, in which the container and the joining system are configured to be arranged at least partly around the free-standing object. 15. A weight system as recited in claim 10, further comprising fill material, in which: the fill material is arranged within the interior chamber through the fill opening with the container in the open configuration; andwith the fill material within the interior chamber and the container in the closed configuration, the container may be arranged to apply a force to at least a portion of the free-standing object.