找到的评论：
From Backcountry.com:
"The Kelty Cloud 5250 Backpack is the pack of choice for PARA rescue units in Iceland and Alaska and for adventure racers, because it is one of the most technically advanced backpacks in the world."
"This innovative pack from Kelty's Ultralight Series is not too small, not too big--it's just right! Modular components allow custom weight and size! This pack series can be stripped down to just a plain packbag with shoulder straps, weighing in at just over a pound. Load-transferring, slow-memory foam hipbelt molds to your body; accepts two gear loops to carry extra gear. LightBeam™ stays weigh half of what traditional stays weigh, yet still supply the stiffness needed for support. Compression straps wrap around pack to pull the load as close to your body as possible, increasing stability. Top pocket adjusts in height and opens with single buckle for easy access. Suspension system features a removable backpanel and frame stays so you can adjust the support you need for different trail conditions. Four-point haul loops and ski lash patches accept gear loops and combine for ample gear room. Spectra® endures up to 500-lbs. breaking strength; this fabric is so tough, not even dye can penetrate it--available only in white. Laminated thread will never rot from UV, chemicals or molds, and along with Kevlar® top-stitching for strength, ensures a long life for this pack. Weight varies depending on which accessories you choose to add for any given outing; Note: weight specification is for bare bag only."
"I bought this because I like the ability to tailor the pack for the type and length of use. Although it was more expensive I have replaced three other packs with this one."
自带一个反重力系统，让人背了之后感觉像在空气中漂浮
不是在开玩笑吧，我才疏学浅，讲讲吧。。。。。。
這個才是最贵的背包
http://www.mchalepacks.com/ultralight/detail/SU_InexCM_alp2.htm
打不开叶
LZ的那款包用了一种特种人造纤维织造,强度很大.同等重量的情况下比钢还要结实,在国外常用于做电锯操作等工作的工作服.一旦不小心身体碰上剧,高强度的纤维会将锯拉停,减少受伤.用来做背包主要是轻.但缺点是这种纤维无法染色,只能做成白色.如果要做成不同颜色的包,则只能参入其他有色纤维这也会令强度降低
谢谢，真是见多识广耶
所谓缺点倒没什么，白色也不难看，可优点似乎不值那个价，不知还有何其它高明之处，相关的介绍Google上也搜索不出来
有点问题.....
如果这种纤维不能染色，否则强度会降低.....
那是不是说这种纤维脏了，强度也会降低？
还是这种纤维就是不会变脏的？
背包需要这么强大的强度吗？
反正觉得说的太玄了~~~~~
看来除了反重力系统，还能防核爆……
有点降落伞包包的味道~~~
到底有啥功能,能卖到这个价格!
是不是最重要的不是包,是包里装的东东?
感觉很安全的说,旁边应该是3个安全气囊...
说明上说的是"无法染色",我的理解是包结实的连颜色都沾不上去...
好东西啊
不错不错,有创意,
应该是LV的最贵
找到的评论：
From Backcountry.com:
"The Kelty Cloud 5250 Backpack is the pack of choice for PARA rescue units in Iceland and Alaska and for adventure racers, because it is one of the most technically advanced backpacks in the world."
From REI:
"This innovative pack from Kelty's Ultralight Series is not too small, not too big--it's just right! Modular components allow custom weight and size! This pack series can be stripped down to just a plain packbag with shoulder straps, weighing in at just over a pound. Load-transferring, slow-memory foam hipbelt molds to your body; accepts two gear loops to carry extra gear. LightBeam™ stays weigh half of what traditional stays weigh, yet still supply the stiffness needed for support. Compression straps wrap around pack to pull the load as close to your body as possible, increasing stability. Top pocket adjusts in height and opens with single buckle for easy access. Suspension system features a removable backpanel and frame stays so you can adjust the support you need for different trail conditions. Four-point haul loops and ski lash patches accept gear loops and combine for ample gear room. Spectra® endures up to 500-lbs. breaking strength; this fabric is so tough, not even dye can penetrate it--available only in white. Laminated thread will never rot from UV, chemicals or molds, and along with Kevlar® top-stitching for strength, ensures a long life for this pack. Weight varies depending on which accessories you choose to add for any given outing; Note: weight specification is for bare bag only."
前两个是专业卖家的评论，这个是唯一能找到的使用者的评论
"I bought this because I like the ability to tailor the pack for the type and length of use. Although it was more expensive I have replaced three other packs with this one."
哪里也看不到“能让电锯停下”的介绍，莫非和“反重力系统”类似？