CATSA has revised the official carry-on regulations effective January 20. The new regulations are very similar to the old (pre-December bombing attempt) regulations, although very slightly different. It appears as though the biggest differences entail a limitation on the size of laptop cases and purses.
Passengers are now allowed to bring one carry-on, and one personal item. “carry-on baggage is limited to a size of 55 cm x 40 cm x 23 cm (22 in x 16 in x 9 in), which is equivalent to the size of a small gym bag”. Carrying cases for laptops must be limited to holding the laptop and accessories only, cases with expandable pockets, wheels, backpack style cases will count as your carry-on bag.
More information on the new regulations can be found on the CATSA website:
http://www.catsa-acsta.gc.ca/Page.aspx?ID=78&pname=carryonbaggage_bagagedecabine&lang=en
