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