Honestly, the mini pochette doesn't fit a lot. When I saw it in stores, it was a lot smaller than I expected it'd be...but I still ended up buying it. It's cute and great for those times when all you need is some cash/ID, keys, and phone. I think if you're concerned about the size being worth the price, you should go with a pochette instead
I think I'd like to use it as an eveningbag. It just looks super cute to me and I love the golden chain on it (unfortunately the larger pochette does not have that)
I'm a bit concerned if it will look too small on me because I'm quite tall (1.80).