How big is a medium size parcel royal mail

According to Royal Mail's size and weight guidelines, a medium-sized parcel is typically defined as follows:

Please note that these dimensions and weight limits are subject to change, and it's always best to check with Royal Mail's website or contact their customer service for the most up-to-date information.

Additionally, Royal Mail has specific size and weight limits for their different parcel services, such as:

It's essential to check the size and weight limits for the specific parcel service you're using to ensure your parcel meets the requirements.