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The present invention relates to a bag for packaging products, particularly food products, which is characterized by a novel structure that allows for a simpler and more efficient production process.The bag consists of a sheet of material with a first transverse edge and a second transverse edge, opposite each other along the longitudinal axis of the bag. The first transverse edge has a protruding portion that corresponds to a gap in the second transverse edge, allowing multiple sheets to be obtained without material waste by cutting them successively.The flattened tubular body of the bag has two areas on its lateral surface spaced apart from each other around the axis of the flattened tubular body itself, which define two bellows-like recesses. These recesses are defined by fold lines that develop parallel to the axis of the same crushed tubular body.The bag is produced with acrylic glues or hot melt glues, and its bottom is closed by at least one heat sealing line, which overlaps the lateral surface of the bag with a portion of the first transverse flap that protrudes with respect to the other part of the same transversal flap. This allows the weight of the packaged product to be distributed evenly and prevents the bottom closure from being directly affected by the heat sealing line, resulting in excellent resistance with a single fold.The bag according to the invention can be produced in shorter times and at lower costs than bags of known types, thanks to the novel structure that allows for a simpler and more efficient production process. Additionally, the reduced content of material that is difficult to dispose of is another advantage of the present invention.The bag may be made with any materials that are technically compatible with its intended use, and its dimensions can be adjusted according to the needs and state of the art.