"It's not that hard but it has such a huge effect," Mirjam said.
Toiletries, flannels, pyjamas - the list goes on depending on what has been donated. And there's usually a book and a toy in the backpack as well.
The backpacks, labelled with the age and gender they are for, and then taken to Child, Youth and Family, who distribute them to children coming into care, many of whom arrive at their new caregivers with just the clothes on their backs. There is a backpack for everyone from newborns to teenagers.
Child, Youth and Family Waikato West social worker Rhiannon White said the backpacks mean a lot to the children, many of whom have never had anything to themselves before.
"The five-year-old girl I gave one to loved it so much that she slept with the bag and her new belongings for over a month and every time she left the home with her caregiver she had to have her bag," said Rhiannon.
"The caregivers also found the bags really useful as they didn't have to rush out and buy essentials with distressed children in tow. They knew that they could get through with what was in the backpack for a few days without further distressing the children."
Foster Hope is having a packing day for volunteers to help pack the backpacks on May 22. Find out more about Foster Hope and how you can help young people in need at www.fosterhope.org.nz