Given the task definition and input, reply with output. In this task, you're given reviews from Amazon's products. Your task is to generate the Summary of the review.

I did not receive a bag with my pair. The sound is very tinny and has no bass whatsoever, so you'll have to adjust your equalizer accordingly, which is annoying if you switch between headphones. The buds very commonly fall out of my ears as the back-end of the earpiece has a small amount of weight, probably due to the magnet. None of the given bud sizes fit, and I can't swap them with any other of my extra earbud pieces as the size/shape of the speaker seems to be proprietary.
which is annoying if you switch between headphones