快递单填写步骤：
1、当你拿东西去寄快递的时候，快递会给你一张快递单。
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2、快递单必须填写寄件人的姓名、始发地、寄件的地址、联系电话，如果寄出去的快递没被接收，就会遣返回来，跟寄件人联系。
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3、快递单必须填写收件人姓名、收件的地址、收件人的电话。电话号码等不能填错，不然快递会被寄到，收货人收不到通知，快递会被寄回寄件人。
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4、收件人和寄件人填好后，确认无误后，在寄件人签名那里填写寄件人的姓名，而快递单下面的一串号码，是运单号，可以在网上查询物流信息。
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5、根据自己寄出去的东西和要寄的地方，付出相应的运费。
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6、物品包装后，把单子填好后交给快递公司。
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快递面单是指快递行业在运送货物的过程中用以记录发件人、收件人以及产品重量、价格等相关信息的单据。目前快递行业多用条码快递单，以保证快递行业的连续数据输出，便于管理。
目前快递面单所用纸张一般为多联无碳复写纸等，加工工艺中主要用到连码、跳码可变码的印刷，多为3联以上，特别是EMS等用的快递单多为5联以6联，可分为普通条码单和背胶条码单，普通条码单需配合快递袋使用，背胶条码单最后一联可撕开贴在货物上。
参考资料：/baike.baidu.com/item/%E5%BF%AB%E9%80%92%E9%9D%A2%E5%8D%95/6935931?fr=aladdin"target="_blank"title="百度百科-快递面单">百度百科-快递面单