Please take a few minutes to listen to this recording and give your feedback on my grammar,pronunciation,and please let me know if it sounds natural or not.
Have a good rest of your day.
"I don't think what you just bought will fit into your bag with all that stuff taking up much of its space."
It makes sense, but doesn't sound like what people would say. It's a bit of a mouthful (too many words). But basically, it's fine until "...taking up much of its space."
I would say something like, "I don't think what you bought will fit in your bag with all that stuff in it already."