Using this SpeedDraw 2 Insulated Handheld Flask is a piece of cake. Just fill it up with your favorite drink, like water or juice. When you're on the go and need a quick sip, hold the flask and gently squeeze it. The design makes it easy to get a drink without any hassle. To store your stuff, put your phone in the power mesh pocket and fold it over to keep the phone secure. You can put your keys or credit card in the small zippered pocket. As for maintenance, clean the flask regularly with warm soapy water. Make sure it's completely dry before you fill it up again. Avoid using abrasive materials that could scratch the flask. And don't put it in the dishwasher, as it might damage the insulation and the pockets.