關於綠卡申請材料裝訂，求助！

在USCIS網站上看到這麽一段：

The use of tabs assist in locating items listed as attachments. The tabs should be placed on the bottom and not the side for ease in filing.

不過在staples看到的legal exhibits reference divider都是side tab的。不知大家有什麽好的建議。謝謝！

還有，大家都是用盒子寄的嗎？