Meh, £125 for a main birthday present- one that is something that can be used for years - isn’t all that excessive.
My DCs use rucksacks for school, but I’ve got a large Longchamp that I’ve used to carry books/laptop, beach towels, and a variety of things for over 10 years, and still looks ok. Cost per use, I reckon im better off having bought that bag than a cheaper dupe that would fall apart.