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Black Diamond designed the lightest backpack on the market so you can take it anywhere. The Cirrus 9 only weighs an ounce and packs down to the size of an egg, so you can stow it in packs for backpacking, climbing, or even traveling internationally. It's a great summit pack whether you're hiking up there, or climbing a multi-pitch. The Splice Adjust shoulder straps offer an innovative, minimalist-minded way to provide an adjustable fit.