The "Duty belt" came into use in the early 1900s, in lieu of carrying the required equipment in greatcoat pockets or additional bags. These early types were almost exclusively made of dark colored leather with simple pockets or clip systems attached, such as the Sam Browne belt. However, there are some issues with the use of a "duty belt", with the large amount of equipment carried on modern duty belts often carrying more than 20 lbs (9 kg) of equipment. Many police officers develop health conditions, such as chronic back problems, as a result of this reducing the effectiveness of the officer.