Specially processed surface of internalslot, effectively Lengthens Its service life.
内槽表面特殊处理，使用寿命有效延长。
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It features a zip-top closure, rolled braided handles, leather shoulder strap, side pockets, internalslot with zipper closure, additional open slot and signature PRADA logo on front.
In addition to balance vortex internal pressure of compressed gas beyond, still provides top and bottom sealing force between the slot, the sealing force to achieve by floating sealing ring.