Originally Posted by
docbert
Is your bag larger than the allowed size? (9 inches x 14 inches x 22 inches) If so, then yes, you should "feel bad".
The maximum carry-on size equates to 46 liters. If your 75 liter bag is even close to full then you are almost certainly over the size limit.
A typical 75L backpack is about 33" high. So yeah, it pretty much blows the carry-on dimensions out of the water. Surprised that the GA let OP board with that.