Question for untreated water container for inline/gravity filtering

I'm currently thinking of buying aquamira Frontier Max (inline/gravity water filter) but I'm not sure what should I use as untreated water container. The filter has both quick connect & quick disconnect adapter and the last thing I need is to use another hydration bladder as untreated water container (too heavy & bulky). Any idea what should I use for untreated water container that is lightweight and also foldable?

Thanks beforehand

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Question for untreated water container for inline/gravity filtering