Hydrapak seeker vs flux

Looking for additional water carry system.

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It will be used to carry more water in isolated areas. I would strap it to my drybag on the rack or to handlebar bag.

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I'm looking at Hydrapak seeker 3L, but not sure if it's robust enough to ride with (friction, bushes). Another option is flux 2 x 1.5L which seems more robust but weighs more and takes more space when packed and cost double.

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Anyone using hydrapak seeker or flux for this purpose? What's your feedback. Any other solutions?

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I like it's foldable and already have Katadyn filtration system which fits both.

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Currently, I'm carrying 3.5 L of water in 4 water bottles.

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https://www.hydrapak.com/products/seeker-3-liter-2021?variant=38624381730967

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https://www.hydrapak.com/products/flux%E2%84%A2-1-5l?variant=49998845542633

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