请大牛们评价以下下面的50L的背包,哪个更好。可以在www.amazon.com里面找到。目前主要的选择纠结在下面的几个品牌: 1.deuter ACT Zero 50 Plus 15 Backpack 2.Granite Gear Nimbus Meridian 3.Gregory Mountain Products Triconi 60 Backpack 4.Gregory Mountain Products Z 65 Backpack 5.Mammut Heron Guide 60L Backpack 6.Mountain Hardwear Unisex Shaka 55 Hiking Backpack 7.VAUDE Astra Light 50 Backpack 8.Arc'teryx Men's Altra 50 LT Backpack 9.Arc'teryx Altra 65 Backpack |