Spare battery, charger, bicycle helmet, day bike backpack (approx. 20 liters) with rain cover, comfortable sports shoes, possibly bike shoes, weather-appropriate and durable layered clothing, possibly cycling jersey, possibly cycling gloves, air pump, bicycle tools, sun and rain protection, snacks and drinking water, water bottle and suitable holder, first-aid kit, pocket knife, mobile phone, possibly mobile phone holder for the handlebar, possibly headlamp and reflectors, maps