Find it hard finish a bunch of bananas before one or two become too brown for your taste? Slow down the ripening process by wrapping a piece of plastic cling film around the crown of the bunch.
Educational weblog SnapGuide suggests using a piece of cling wrap around the size of your fist. Each time you remove a banana carefully remove and replace the cling wrap. If done correctly this trick should give you another three to five days before your bananas are too ripe to enjoy. (Even then, they're great for baking or as a frozen treat.)
How to Keep Bananas Fresh Longer [SnapGuide]