Bestof when listing formats that 7 zip supports It ' s good to have a single utility that can do them all , rather than different programs for each one . WHERE IS THAT UNIX PHILOSOPHY ? I have different utilities for every one of them . There ' s one utility that calls upon that . Many better . Much compression . Also , first thing I install on Windoze all of the compression utilities gz , zip , . NEXT NEXT NEXT I ACCEPT INSTALL . ALL OF THEM . <| sep |> I honestly do not know why people ask for zip codes because unless you use a priority mail zone pricing , it ships at the same price whether you are shipping to your next door neighbor or from east coast to west coast . I ship about 220 items daily due to my online retail business and I remember using this option less than 10 times in 6 years , and have not used it for at least 2 years because I Need a special box ordered from USPS . I just ask what countries they are from , and quote the price . there is a section on USPS site that gives you an estimate , but you will need to weigh the package . if you are planning on selling a lot , I suggest you get a scale , but if not , you can just guess the approx weight and give your buyers estimatesMost items I ship in a bubble mailer via first class , and if it goes over 16 oz , your best bet is priority flat rate envelopes boxes which you can get from USPS retail locations for free