Backpacking gear is the way to go for quality and space saving. Goose down, though the most expensive, is the most compressable material, and ounce for ounce, nothing will keep you warmer, so makes the ultimate sleeping bag. It is worse than useless if it gets wet though. Stuff sacks that have compression straps make things even smaller. A good 2 or 3 man backpacking tent can be less than 7 lbs if you get a good one from a company like Sierra Designs, North Face, or Moss. Cabela's has good stuff too, and great customer service. REI is another good source for quality items. Thermarest pads are the best, bar none, and make the difference in a good night's sleep. Use your clothes in a stuffsack for a pillow. Candle Lanterns will illuminate the inside of a small tent sufficiently, or get one of the small backpacking lanterns by Peak I or Gaz...equivalent to about a 60 watt bulb. You can eat almost anything with just a spoon and a pocket knife. A 2 quart aluminum pot with lid serves up most stews or other one pot meals you put together...one eats out of the pot, the other out of the lid.
If you know what you're looking for, Sierra Trading Post is an excellent source for closeout items, or discontinued merchandise, which may just be a color or some small style change. They also have excellent customer service, and I've been getting stuff from them for over 20 years.