I really like my Lezyne multitool. About the most sturdy one I have seen so far, includes a chainbreaker as well. I carry that and a bone type wrench.
http://www.lezyne.com/index.php/stainless-24.html
http://www.bikeworldusa.us/Tool-Bone-Bicycle-Wrench-Metric-8/M/B000NJGOB2.htm?traffic_src=GB&utm_medium=CSE&utm_source=GB&id=uk
@pascalo started
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I really like my Lezyne multitool. About the most sturdy one I have seen so far, includes a chainbreaker as well. I carry that and a bone type wrench.
http://www.lezyne.com/index.php/stainless-24.html
http://www.bikeworldusa.us/Tool-Bone-Bicycle-Wrench-Metric-8/M/B000NJGOB2.htm?traffic_src=GB&utm_medium=CSE&utm_source=GB&id=uk