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Reviews around good (5.00 of 5)
Premium Cell Phone Dual Case Pouch Double Decker Fits Two iPhone XS Max, 8 Plus, 7 Plus, 6 Plus, 6S Plus with Ultra Thin Case/No Case/Similar (Each Phone Measuring 159 x 80 x 9mm or Less)
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This is the larger size model though, so smaller version may work for you as well.
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