Australia Post and the National Archives have teamed up to create the Dear Australia project.
Australia Post is asking Australians to send a letter about their experiences during the COVID-19 pandemic.
The National Archives will then preserve these letters for future generations.
Nicole Sheffield, Australia Post executive general manager community and consumers, said as an essential service, Australia Post has had a spike in activity during COVID-19.
"The idea [of Dear Australia] came about when we realised how isolated many Australians were and how important the post office was in their daily lives," she said.
"We want Australia to pick up a pen and start writing, we want a message of hope a message of community spirit."
Ms Sheffield said the letters could cover a range mediums, such as poems, songs and artworks.
"This is actually a moment of history and you should use it as an opportunity to reflect on its time," she said.
Twelve-year-old Tyler is one of many Canberrans who have already sent their letters into the project.
"My experience with the COVID- 19 restrictions was interesting in the way that I didn't mind that the schools were shut or that sport was off," he said in his letter.
"What hit me was not being able to see my friends on the weekend because it got quite lonely without the social interaction.
"Now I am just waiting to find out when things are going back to normal, or if 'normal' is a thing of the past."
National Archives director-general David Fricker said Australia had a responsibility to document the COVID-19 crisis to help future generations.
He said by gathering information about how Australians dealt with COVID-19 "next time Australia faces a pandemic we will be more resilient informed and better able to deal with it".
"We at the national archives leapt at the chance to join in with them in this really exciting project," Mr Fricker said.
Mr Fricker said that due to the lockdown and isolation "the national story about how we confronted this pandemic is actually made up of millions of very individual experiences".
"We should remember that," he said.
"We keep referring to [COVID-19] as unprecedented.
"It's not unprecedented, its unprecedented in our lifetimes.
"If we look way back through human history - we've faced pandemics before.
"In the beginning of the 20th century we experienced the great influenza pandemic, which did come to Australia."
Mr Fricker said while there was information about past pandemics documented in the archives, the information was still limited.
"We are the keepers of the nation's memory. The opportunity to keep these individual experiences as individual stories is a wonderful opportunity," he said.
Some ACT Dear Australia letters
Dear Australia, by Heidi, Fraser, ACT:
"We stopped spending an hour a day in the car and rushing everywhere. We all swore it wasn't us that stockpiled toilet paper and pasta sauce. At first we cleaned our houses and learned to make bread. We gave ourselves haircuts with a glass of wine in our hands while we stared resentfully at the pasta sauce in the pantry. We bought shit online and took out the bins ... there is a light at the end of the tunnel in this year scripted by Stephen King on a bender."
Dear Australia, by Mitchell, Gunghalin, ACT:
I have been impacted by COVID-19 in a positive way. I have been working from home and because there is no work I can do at home I have essentially been paid to my full wage to say at home and sleep in. [The] majority of my friends are tradies and they have all been working full-time. The negative impact of COVID-19 on me has been the closure of the pub and also the clubs but this also means I have been saving almost the entirety of my pay cheque.
- Australia Post will accept letters sent until August 18. To contribute to the campaign, send your letter to Dear Australia, Locked Bag, Australia, 9999.