CheckDeiBag is a product test with focus on the connection of social media and local retailers. In cooperation with five rucksack brands a group of 120 product testers, mainly students, get a rucksack for 6 months. During that time various contests and photo challenges connected to the products are launched in social networks. As a result the testers create content that is liked to the products, brands and the retailer. A second result is their feedback on the products. With this, the manufacturers will try to improve the products in the fields of functionality and sustainability. The fun tonality of the project clearly speaks to the target group of students and will increase the reputation of the local retailer in that specific target group. Started in the offline world this projects was aimed to create an online interaction between testers, retailer and brands.