Hi Astrix
1) I have measured volume of Fly and Optimus side by side using thermocole balls. It measured 19.5 Units on the Fly expanded and 24.5 Units expanded on the Optimus. Which means if the Fly 20L as advertised, Optimus should be around 25L max against the 31L as advertised. Higher but not as big they say.
2) The same multi functionality is available in fly too. To convert it as a backpack on the fly, all you have to do is pull out the shoulder straps from its pocket and shove it back when you are done. Whereas on the Optimus, you will have to unzip the magnetic base completely and store it somewhere to use the shoulder straps.
3) ViaTerra uses 6 small neodymium magnets per disc(three discs per bag). Rynox uses 5 single ferrite magnets according to there website. From the touch and feel of it from the outside, to me it feels like a single big magnet. Can you please show the source where you got the information from?




. I will suggest slightly smaller Claw mini or Raptor for the tail.
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