Volunteers at the store were left with the hefty clean-up job and a bill the organisation will have to cover for its disposal.
In Kyabram, Vinnies spent more than $130,000 last year on good works in the local community, such as helping out with food and fuel vouchers or paying utility bills when needed.
And they say they'd rather spend more money on helping people doing it tough, rather than cleaning up junk.
A spokesperson from St Vincent de Paul Society Victoria said they were extremely grateful for the good-quality donations but warned they spend considerable time and money disposing of goods that cannot be used.
“It’s important to be discerning about what makes a suitable, quality donation,” they said.
“Many of our shops are open seven days a week and we welcome people to bring their donations into our shops so we can personally say ‘thank you’.
“Our dedicated Vinnies volunteers take great pride in our shops and the goods we on-sell and distribute to people in need; so we request that donations are in reasonable condition for subsequent use.”
Vinnies only receives one per cent government funding for the programs they offer. The rest is financed through the sale of goods in op shops and generous donations from the community.
As Christmas looms and families in need rely heavily on services such as Vinnies, it's important to donate well, and donate often.
Call the Kyabram Vinnies on 5852 2874 to find out how you can help.
Police have been notified of the rubbish that was dumped and are investigating.