single-company strike in u.s. history could be just a week away. u.p.s. and the teamsters back at the negotiating table today. the two sides haven t met since they walked away following a marathon session over the july 4th weekend. u.p.s. knows they need to pay our members. reporter: since then, the teamsters who represent 340,000 u.p.s. workers have taken to the streets for rallies and practice pickets. president sean o brien leading the charge. this will be our defining moment in the teamsters union. it will be the defining moment for labor. we have organized. we re strategized. now it s time to pulverize. reporter: both u.p.s. and the union say 95% of the contract is done, but the 5% left unfinished is the biggest piece of the pie. pay. stuff doesn t go anywhere unless we move it. we re the ones that are making all that money and we don t see it, any of it. reporter: part-time workers
exclusively package handlers and sorters. without these folks you re not going to get the package delivered to your front door. their starting salary $16.20, on average they make $20. they say they can t live off of that money, especially in places like california and new york. the average u.p.s. full-time worker makes $95,000 a year but they re all unified in this, and getting ready to strike if it comes to that. listen to what one of these part-time workers had to say. she has three boys and says she can barely pay her bills. the packages don t move unless we move them. the stuff doesn t go anywhere unless we move it. we re the ones that are making the money and we don t see any of it. like you re getting million dollar salaries and stuff and we re over here struggling to survive. how is that fair? you ve already gotten our blood, our sweat, our tears and everything, you know, it s taxing on the body.