A urine collection bag (1) comprising an anti-reflux valve in the form of a foil valve (8), located at the inlet (5) of the bag. The valve secures a liquid tight seal of the bag when filled and that no reflux occurs during catheterization. The bag comprises a tube member (11) that can be brought in a position so as to bypass the foil valve and the bag can be emptied in an easy and non-messy way.
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