Bag solutions for Varg SM/EX?

[flux]

Anyone know of a nice clean way to mount storage onto a Varg, like a rear mounted bag or something? Ideally something big enough to hold the mobile charger and my j1772 adapter . Back getting sore after carrying them around in the backpack for too long

 

[Beagle]

I remember someone here (from Germany?) posting about his set-up with the original charger put on the bike (obviously in another case) but couldn't find the thread.

Mobile charger is 14.7 × 6.1 × 25 cm (5.79 × 2.4 × 9.8 in)

I think I would go for a tank bag like

11 liters, 43.0 x 25.0 x 23.0 cm / 16.9 x 9.8 x 9.1 in

https://sw-motech.com/en/products/luggage/tank+bags/PRO+tank+bag/4052572201565.htm

or even better (and cheaper), a saddle bag like


8 liters, 19.0 x 9.0 x 35.0 cm / 7.5 x 3.5 x 13.8 in

https://sw-motech.com/en/products/luggage/tail+bags/Drybag+tail+bags/4052572240380.htm