Designed for holding smaller (e.g. finch) and medium (e.g. thrush) sized passerines and waders during ringing operations. These lightweight, breathable cotton bags have a specially designed dual-pull drawstring system to help closing. The bags are sewn with double seams so that there is no chance of birds getting their feet caught whilst held. The bag depth has also been carefully calculated to aid in the safe and efficient removal of birds.