For being convenient to change the outside material face layer, the wrapping outside material can be provided with a zipper or a thread gluing device.
为方便外材面层的更换，所述包裹的外材上可以带拉链或粘扣装置。
Below the emergency instructions is a small 1-way zipper that permits access to the inside of the lid itself, for use as a pocket, separate from one on the outside of the lid.
下面的紧急指示是一个小的单向拉链允许访问的盖子本身里面，作为一个口袋里，对外面的盖子从一个单独的。
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