Upvote:5
The maximum luggage dimension is 118 inches
In your case the luggage dimension is 67 inches. I do not see it being a problem unless it weighs more than 30 kg.
You will only face an overweight charge if it is more than 30 kg. (depends on the 'friendliness' of the person at the check-in counter)
However if it is more than 32 kg then you will have a problem because you will have to split the weight. Qatar Airways does not allow individual pieces of luggage more than 32 kg.
But since your question is about the dimensions; you don't have to worry about it. Why are you confused about it; it's already mentioned clearly on their website.
As a further check just confirm what's written on your itinerary.