Calgary's first Bare Bottoms Diaper Drive has collected more than 20,000 diapers for local families as of Sunday afternoon, organizers say.

Volunteers have been collecting diaper donations at the Calgary Zoo all weekend. The diapers will go to local food banks to be distributed to families in need.

Organizers estimate that roughly one in five mothers struggles to provide diapers for her children.

The initiative is aimed at raising awareness about diaper need and collecting as many donations as possible.

So far, donations have come from local businesses, churches and zoo visitors, among others.

The Bare Bottom Diaper Drive ends Sunday but local food banks will be accepting new or opened packages of diapers throughout the year.