Also get reusable water bottles. I've used the same 48 oz one for about a year and a half now, and it's drastically cut down on how many plastic bottles I've gotten. Plus it saves money! I have one of these ones from Nalgene. If you keep your eyes out, they're on sale a lot of the time. I picked mine up from REI for about $7. Avoid plastic bags, 95% of the time paper bags work just as well for things like sandwiches, chips, and popcorn. If you need something a bit more durable use aluminum foil, since that's recyclable.