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               Originally Posted by 
              joelr  
              I got one US-10, one US-20 and one tank fitting plate
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         And you can use either of them with the harness, or fasten them together to make a 30l tail pack, or use one on the harness and one as a tailpack, or you can buy another US10 and have a 40l tail pack. 
         
        
 Really well thought out this stuff.