封口带又称PTFE(铁氟龙)无接缝纤维环形，它彻底克服以往输送带的接口连接、叠压连接、热压连接等的连接处断裂、连接处跳动、连接处周长不等而造成走行稳定性差、跑偏偏带等现象。
信封是用胶黏带封口的。
遵守3-1-1准则： 3-1-1准则适用于随身携带的液体物品，即每位乘客允许随身携带的液体化妆品每件不超过3.4盎司（约合95ml），总量不超过1夸托（合1.14升），用1个带封口的袋子包好。
Abide by 3-1-1: Yes, the 3-1-1 rule for carry-on liquids—the one that limits all passengers to one quart-sized zip-top bag of liquid toiletries of no more than 3.4 ounces each—is still in effect.
外部拉链挂带磁翻板封口袋。
External front zip hanging pocket with magnetic flap closure.
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