To determine the size of your laptop, you can use the following methods: 1.) Check Laptop Specifications: Look for specifications on the backside of your laptop. 2.) Visit the Official Site or Google: Check the official website or use a search engine with the exact model name of your laptop to find its dimensions. 3.) Manual Measurement: Use a measuring tape to measure diagonally from the bottom left to the top right of the laptop screen. By utilising these methods, you can ensure the perfect fit for your laptop in our laptop bags or sleeves. If you have any specific concerns, feel free to reach out to our customer support for assistance.