No rule for this one
No ending or word group predicts the article of Verband. Learn it as a pair and say it out loud: der Verband.
der Verband
It's der Verband. Verband is masculine, plural die Verbände.
Der Verband ist fest.
The bandage is tight.
Sie braucht einen Verband.
She needs a bandage.
No ending or word group predicts the article of Verband. Learn it as a pair and say it out loud: der Verband.