I’ve done coffee a lot of ways:
1. Buy gourmet coffee bags (like tea bags). Works pretty well, pretty light but pricy. I usually leave the coffee grounds buried next to a plant since they are a good natural fertilzer. burn or carry out the paper.
2. Buy self sealing tea bags and make my own gourmet coffee bags – same as above but cheaper and I can use my favorite coffee (sorry don’t have url with me right now for site that sells these, but I’ll post again later).
3. little plastic coffee spoon-like thing with built in filter. works good, but harder to keep water/coffee warm while it steeps since handle sticks up out of cup. cheap, light. they have these at REI and other places.
4. similar to above but is small cone that fits over top of cup with screened cone below inside cup – not as light, still pretty cheap and easier to cover cup while coffee steeps.
5. long time now since I’ve used this one – those one cup plastic cones that take paper filters and sit on top of cups. cheap, but falls off easily, water cools too fast, and you still have paper to dispose of.
6. cowboy coffee – put coffee right in pot and then pour or scoop out coffee. you eat a few grinds, but it is cheapest and lightest option. also makes pretty good coffee and best option for full hot coffee aside from the coffee press methods, which are too heavy.