A ballast bag includes a top portion, a center portion coupled to the top portion, a bottom portion coupled to the center portion, and a spring coupled to the top portion and the bottom portion and encapsulated by the center portion, the spring being capable of expanding the ballast bag from a compact state to an erect state, the ballast bag being capable of retaining water in the erect state.
Auto erected ballast bags
2019-10-08
Patent
Elektronische Ressource
Englisch
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