A Backpack is a centralised service where learners can manage their badges. The Backpack is an online platform like OpenBagdes.org1 . Learners register with this service using the same email account they used to earn badges on various sites. When registered with the Backpack the learner can aggregate all the badges they have earned from numerous sites and create publicly accessible pages to display them.
In this way a Backpack service provides trusted verification of your badge for other interested parties. A future employer (for example) can trust that the learner has earned the badge because: