Most economy fares allow 23 kg per checked bag. The trap isn't packing too much; it's a suitcase so heavy or so big that you're paying extra before you've added a single gift. Choose a case of 157 cm or less in total (length + width + height, wheels included) that weighs under 5 kg empty.
That size fits Air Canada (158 cm) and WestJet (157 cm) and leaves most of your 23 kg for your things. Flying Emirates? It allows only 150 cm, so check your airline in the table below.
Medium beats large
A "medium" suitcase of about 65–70 cm tall usually lands at about 150–157 cm in total. "Large" 75–80 cm cases often go over 158 cm, and filled to the top they weigh more than 23 kg anyway. A medium hard-shell spinner is the size we'd pick for most trips; polycarbonate flexes instead of cracking when baggage handlers are having a day.
If weight is your problem, a soft-side checked bag under 4 kg leaves more of your allowance for gifts and food from home, and it expands for the trip back. Just watch the 158 cm limit when it's fully expanded.
Flying home with gifts
Two medium bags are much easier to keep under 23 kg each than one giant one, and many long-haul economy fares to South Asia and the Gulf include two. A two-piece luggage set works well here: the carry-on nests inside the big case when you fly out light.
Don't pay for the last kilo
Airlines charge per kilo or a flat fee once you pass 23 kg. A digital luggage scale settles it at home, after the last box of sweets goes in, and it's small enough to pack for the return. Add a TSA-approved combination lock if you connect through the US: security can open it without cutting it, and there's no key to lose.