I found a really useful little article from tgo magazine on ways to reduce your impact on the environment - it's aimed at walkers but there's a lot that is relevant to 'bikepackers' - especially if you 'wild camp'.
TGO Magazine - Minimum Impact (pdf) from www.tgomagazine.co.uk.
TGO Magazine - Minimum Impact (pdf) from www.tgomagazine.co.uk.