Andrea, if you are in business class on SAA, your limit is higher.

From their website:
First and Business class

South African Airways will accept two pieces of cabin baggage, each not exceeding a total dimension of 115 cm and 8 kg in weight.

Economy class

South African Airways will accept one piece of cabin baggage not exceeding 115 cm and 8 kg in weight.


In addition to the above are the following items may also be accepted carry-on baggage subject to space availability:

Handbag, pocket book or purse
Overcoat, wrap or blanket
Umbrella or walking stick
Small camera and / or binoculars