Bamboo

Band-aids

Barbecues (mostly metal)

Batteries (car, alkaline, NiMH, NiCad)

Blankets

Blankets (electric)

Books

Bottle tops (metal or plastic)

Bottles (plastic or glass)

Boxes (cardboard)

Branches (large, up to 20cm diameter each and 1.5m long)

Branches (small, up to 7.5cm diameter)

Bread bags (plastic)

Bread tags

Bubble wrap

Bricks or rubble/building materials