the present invention provides for a plastic sheet , especially one used in the construction of a plastic trash bag , which provides improved tear propagation properties . the plastic sheet has a plurality of protuberances in the plastic sheet , the protuberances defining a first set of substantially parallel curvilinear lines in a first direction , and optionally , a second set of curvilinear lines in a second direction . the plurality of protuberances can be either indentations or protrusions in the plastic sheet , preferably formed through an embossing process . preferably , the protuberances are circular in shape , but not necessarily uniform , and alternate between indentations and protrusions along the first , and possibly the second , curvilinear lines with the curvilinear lines preferably being wave - shaped .