Spare battery, charger, bike helmet, day bike backpack (about 20 liters) with rain cover, comfortable sports shoes, possibly bike shoes, weather-appropriate and durable clothing in a layering system, 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 mobile phone holder for the handlebar, possibly headlamp and reflectors, map material