Just got the steamdeck, travel frequently and put charger behind the black strap on case. Is there a more secured way?
That’s the intended method. I never had any problems with it, but if you do, you probably need a third party case.
I could never get it to stay.
JSAUX makes a case that lets you store the charger inside the case, but I found it too bulky.
Instead I use the JSAUX ModCase with cover, and then travel with an Anker cube that can hit 45W on one pipe. I use it for my phone and Deck.
I know for the original charger with the shorter cable people made 3d printable holders for it to fit more snugly, but I don’t know if those would work for the OLED charger with its longer cord.
You might need to get a third party case with an internal storage compartment - eg the jsaux case.
It all depends on your power brick. Here in Europe it doesn’t fit because of the prong format.