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