Typically, most major airlines don't have a specified maximum weight for personal items. Just as long as it fits underneath the seat in front of you, it should be good to go.
Do airlines weigh your handbag?
Are cabin bags weighed? They can be, but more often they are size-checked. We recommend that you ensure your bag is within the weight and size limits the airline specifies if you want it on board with you. If the staff deem your bag too big or too heavy, it will be checked.
Do personal bags get weighed at airport?
Do airlines weigh my backpack?
Bags are weighed at check-in and many airlines have placed bag sizers at their gates. If your carry-on bags are too big, you will have to check them. This might cause them to be classified as "extra bags" which usually carries an extra charge. Be sure to check your airline's website prior to travel.
Do personal items get checked?
They are not checked in before your flight and are normally stored in the overhead storage compartment above your seat.