SunnyBAG offers besides solar bags, solar backpacks and solar chargers also accessories for these products. With the PowerStick and the PowerBank (= battery packs with different power capacities) SunnyBAG products with direct USB charger can be upgraded easily. Solar energy can be buffered with these power packs in order to recharge mobile devices with environment-friendly power at a later time (e.g. at night or at adverse weather conditions).