Labelling your personal property with your name and number is a good habit to get into - but not the smartest if it happens to be a bag of MDMA.

The zip-locked bag of party drugs, found at last month's Maroochydore Music and Visual Arts Festival (MMVAF) on the Sunshine Coast, contained the message "[name]'s Mdma if found call [number]".

Sunshine Coast Police said the "find" made their job a lot easier, and charged a 21-year-old Dalby man with possession of dangerous drugs on Monday.

He will appear in court at the end of September.

More than 6,300 people attended the MMVAF on August 26.

On the day police, using drug detection dogs, charged 52 people with drug related offences.

Drugs seized on the day included cannabis, MDMA capsules, pills and methylamphetamine powder.