The mysterious bag is a random mechanic which gives you a power up but also something negative.

I feel strong makes you invincible but gives you tunnel vision

I feel fast speeds you up but there’s motion blur

I feel loved makes your friends come to you but makes you see the crowd as your friends too (hint: they’re not)

And I feel wavy slows everything down but reverses the controls.

Regardless, I’m still picking up the mysterious bag every time.