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The Peak Design support page mentions that you can pinch the foam and squeeze the clip on for thicker straps, but I'm still dubious as to whether I can get it on my multi-day packs

Tests conducted by ICUBE at the University of Strasbourg, a world-leading research center in biomechanics, found that helmets with the RLS reduced Peak Rotational Velocity by an average of 56-66% across different impact locations, compared to the same helmets without RLS

You can fit a laptop (up to 16 inches), a few accessories, and not much else