So I had a birkin 25, then I purchased this barenia toile on Vestiaire thinking its birkin 30 also its description said its 30. However I just received my birkin 30 in Vache liegee today and it’s size is so different from the barenia toile. It turns out it’s a Hac.
this is how it looks next to each other:

this is how it looks next to each other:
