I've got both the M2 and the Barnacle, which basically is the smaller version of the Anemone. The Barnacle had the contents of the AMK .3 medical kit in it and it was filled to the max. IMHO: get the M2 for the additional space.
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''It's time for Plan B...'' ''We have a Plan B?'' ''No, but it's time for one.'' -Stargate SG-1