[petecox]

Not all brands, obviously, but don't assume the 'bag' itself is biodegradable.

Anecdotally, certain fancy tea bags survived an 18 month composting cycle, which I had to then pluck out by hand before spreading said compost on my vegie patch.

Be kind to worms!

[cpcallen]

Most 'biodegradable' plastic is PLA, which will compost but not in home composters, which don't get hot enough.