Now you can carry your V2 carts in your pocket without the standard pack's crinkly plastic and aluminum foil announcing your every step.The box closes with 3mm x 1.5mm magnets (http://smile.amazon.com/gp/product/B00K599QQA/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1). I recommend using five in the body and five in the lid for a more secure fit, but it's up to you. Tolerances vary depending on your printer and settings, but the magnet holes will ideally be slightly undersized. Use a soft mallet or a hammer with some cardboard to insert the magnets. They should stay put without superglue, but I guess it couldn't hurt. Another tip regarding the magnets: flip the magnets on one side of the case so the lid will only snap in the correct orientation. Between that and the little slots, you won't even need to look at the case to close it.