After over 2 years of cloth diapering, I finally got around to testing the absorbency of my various inserts and thought it would be helpful to share! All numbers in ounces.
Stretchy bamboo flat (Imagine brand from Nicki's Diapers): 9
Bamboo flat (brand was discontinued): 7.5
Organic cotton flat (Nicki's Diapers): 7
Organic cotton prefold (Osocozy size small): 6
Large hemp (Thirsties): 4
Standard microfiber insert, used less than one year (various brands, includes both standard white microfiber and charcoal bamboo): 4
Medium hemp (Thirsties, these come with their pocket diapers): 3
Small hemp (Thirsties): 2.5
Large organic cotton doubler (Cloth-eez brand from Green Mountain Diaper):