Aldi has launched its the Aldi Blind Box giveaway to tap into the “unboxing” trend, giving shoppers a chance to snag a free box of store goodies and add some mystery to their shopping haul, the company announced in a news release.

Between June 22 and June 25, the store will release a designated box per day with theme products with Aldi shoppers watching online for a chance to claim them and have them delivered to their home. 

“The ALDI Blind Box taps into the excitement our fans already feel walking our aisles,” said Bridget Kozlowski, the company’s director of communications, in a statement. “Our shoppers come to ALDI for value, but they also come for discovery. From viral ALDI Finds to tried-and-true products shoppers love to tell their friends about, people love the thrill of discovering something new here. With surprise unboxings more popular than ever, this is our way of helping customers discover even more favorites.” 

The boxes are available on a first come, first served basis.

The free bundles come in four different varieties.

Snack Blind Box: This bundle is a craveable mix of popular snacks.

Fiber Blind Box: This is a wellness-heavy box filled with treats and foods that are “easy on the stomach and even better on the taste buds.”

Protein Blind Box: This is a box filled with protein-packed items.

Mystery Blind Box: This box contains a “secret” mix of items from across each aisle of the store. Aldi hints that the box will make foodies happy.

Last year the grocery chain launched its  “Quarter Club” campaign offering shoppers a chance at a year’s worth of free Aldi items.