Abstract: The present invention relates generally to a system for customizing a device case or bag. Non-limiting examples of device cases include cases for laptops, tablets, and cell phones. Non-limiting examples of bags include purses, briefcases, portfolio, backpacks, satchels, totes, camera, messenger, duffel, athletic, firearm, waist/fanny pack, and travel. More specifically the present disclosure relates to customizable features for the device cases and bags such as removable handles and removable multifunctional pieces. In some embodiments, the multifunctional piece may be a mouse pad, a closeable pouch, an organizer, a cell phone holder, an e-reader holder, a tablet holder, a wallet, a purse, a clutch, a card holder, a firearm case, a camera case, and a solar charging station.