What is considered as high memory for a USB flash drive?

My laptop is low on memory to begin with, it does not have much storage space because it's a Lenovo ideapad, but looks like a laptop.
What is considered as a high memory/ large storage space for a USB Flash drive? The ones I have is 8GB or 16GB, and I think that's not enough space for long term use.
I needed to use it mostly for files, like music, photos or Word documents. What is a decent or good amount of memory for a USB flash drive? How many GB is high memory?

You could buy a 1TB external USB hard drive for less than $100

With storage, the bigger the better. You can never have enough storage.

I think flash drives can extend up to 32GB and 64 GB. If you need more than that, get a hard drive.