It has no storage whatsoever, but my shooting season here has been given extra time at both ends by the heated jacket I got on Kickstarter from Ravean (now at ravean.com, and their latest jacket is in production after an Indiegogo campaign). The heated puffy down jacket is pretty remarkable. On low, the (admittedly heavy) battery lasts most of the day, and if I set it on high for my commute (which has some long walks), I can typically get two or three days of commuting. FWIW, and no financial interest, just sharing info that might help other photographers/outside types.
Thanks for the link to this. I've had one of those ScottEvests for a few years and it's fine, but the Pixentu is well worth checking out.