Fastest marathon carrying a 20 lb pack (female)

According to Official Guinness Records,

The fastest marathon carrying a 20-lb pack by a female is 3 hr 22 min 53 sec and was achieved by Ryoko Eda (Japan) at the Tokyo Marathon 2015, in Tokyo, Japan, on 22 February 2015. Ryoko Eda is a marathon runner with a personal best time of 2 hr 24 min 54 sec, which she achieved at Nagoya Women's Marathon in 2005.

For a complete list of 2015 records, please visit 2015 Guinness Records in Japan.

Other Japan records that might interest you:

• Fastest marathon carrying a 40 lb pack
• Highest combined age of three generations to run a marathon
• Heaviest strawberry
• Heaviest pummelo/pomelo
• Largest music lesson
• Longest woodblock print
• Longest single line of dancers