| 摘要 |
A light, ruggedized, easily used, easily storable and shippable article suitable for free-weight training at any number of pre-determined weights, is disclosed. The invention provides a bag suitable for filling with a readily available material such as sand or soil. The bag includes a pouch including indicia presenting a calibration marker. The bag also has a handle and a fixing structure. When one material from a predetermined set, for example dry, fine sand is filled in the pouch to the calibration marker, the bag is at a substantially pre-determined weight. The bag is then cinched tight with the fixing structure. In this fashion the bag may be gripped by the handle for free-weight training at a substantially predetermined weight. In preferred embodiments, the bag also includes orthogonally intersecting, reinforcing bands at the exterior on the bottom of the bag for rugged, long lasting use. Also a gap may be formed between the intersecting bands and the bottom of the bag, to allow other items to be hooked or otherwise attached at the bottom of the bag for portability. Preferably also includes indicia in addition to the calibration marker, for example filling and folding instructions, as well as a website URL address where the user can observe calibration data for various materials and other information.
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