A set of six stamps has been launched to mark the start of scouting on Brownsea Island 100 years ago.
Rhys Jones' mountaineering record is honoured on one of the stamps
The stamps show the achievements of past and present scouts, including record-breaking mountaineer Rhys Jones, 21, from Cadnam, Hampshire.
He is the youngest person to scale the highest peaks on the seven continents.
Scouting began in 1907 when founder Robert Baden-Powell set up his first camp for boys on Brownsea Island in Poole Harbour, Dorset.
Since then, the Scout Association has grown to become the world's largest youth movement with 28 million members across the globe.
The stamps are illustrated by Japan-based artist Jez Fry and depict the movement's achievements.
Former scouts include 11 of the 12 astronauts who walked on the moon and the pilot to complete the first non-stop solo flight around the world.
Rhys Jones, 21, whose achievement is noted on the 46p stamp image of scouts rock climbing, said: "It is an honour to have my achievement featured on one of Royal Mail's scouting centenary issue stamps.
"The images on the six stamps really reflect the adventure that I and my friends have got out of scouting.
"I certainly got the inspiration for my biggest adventure through scouting, and I hope others will too."
Nearly 500,000 young people in the UK will join in this year's centenary celebrations, including a replica of the first event on Brownsea Island and camp in Essex for 40,000 youngsters from around the world.
Former Blue Peter presenter Peter Duncan, the UK's chief scout, said: "To have a scouting centenary issue of Royal Mail stamps is a great credit to scouting and all it has achieved over the past 100 years.
"Fittingly, the stamps echo the core principles of scouting today - adventure, personal development and achievement, community spirit, inclusiveness and volunteering.
"We are looking forward to continuing this adventure for many years to come."
Julietta Edgar, Royal Mail head of special stamps, said: "The stamps which mark this important anniversary will be seen by millions of people around the world and I hope they will inspire future generations of young people and bring back happy memories for many others."