A flexible bag material made of plastic material for the packaging of dry food products such as cereals wherein the plastic material is a multilayer film. The multilayer film comprises at least one high moisture barrier layer (10, 15, 20) made of HDPE, a moderate oxygen barrier layer (40) made of a blend of amorphous polyethylene terephthalate (PETG) and PE having a oxygen permeability of 400 cm3/m2/day or higher when measured at 23°C and 0% relative humidity, and a peelable sealing layer (50). The flexible bag material is especially suitable for manufacturing an inner bag of a bag-in-box package having an outer rigid box made of cardboard, in particular recycled cardboard.
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