Why does Eren loses his equipment after being Titan? Why does Eren loses his equipment after being Titan ?
And why Annie doesn't lose the equipment after being Titan ?
That old bearded titan who ate Eren didn't take a bite of him, he swallowed Eren.
so Eren will be dissolved in his stomach's acid, but Eren unconsciously activated his titan power and turned into a titan and....
so his ODM gear slings must have been torn apart while he was inside the titan's belly.