Postmen and women will pick up parcels from the doorsteps of people's homes across the UK, as the company tries to grab a bigger share of the booming parcel market.
Households that have packages they need to send can now do so without leaving home for a 72p charge per parcel, Royal Mail said.
The parcels can weigh up to 20kg and can be a little over twice the size of most airplane hand luggage (61cm by 46cm by 46cm).
It was hailed by the postal service as "one of the biggest changes to the daily delivery since the launch of the post box in 1852".
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