| 摘要 |
A single backpack is provided for allowing a simple conversion between an extended form for long duration hikes and a collapsed form for short technical climbs on ice and rock. The backpack comprises a frame that includes a pair of aluminum bars fastened to a frame surface of the pack. The main frame bars extend partially up the frame surface of the pack shell. The remaining distance from the top of the main frame bars and the top of the shell is spanned by extension bars which are held and fastened against the main frame bars. The main frame bars, with the addition of the extension bars, make the backpack a full sized large capacity hiking pack capable of bearing loads of 70 pounds or more. The backpack may be converted to a climbing pack by removing the extension bars from their fastened position and subsequently the shell collapses to the level of the lower main frame. The extension bars are easily unfastened and may be carried within the pack or stored with other non-essential pack gear at the base of the climb.
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