Everybody seems to be giving you good info, backpacking style is probably number 1. Go to REI and dream.....then go on line and shop for similar off brands. I am still learning but enjoy these kinds of topics as I improve my setup every year. I will be at the Kerrville Serv yourself rally if you want to talk more in person. Some things I have learned that work for me that cut down drastically on weight or bulk are below.
Food--I don't carry a stove. Riding BDR and harder type stuff....it is not about luxurious eating at camp for me, it is about riding!!
I carry a rudimentary cooking tool called an adjustafork (pic below) and a metal cup to heat on the fire. The week before my trips, I call the various National Forests or BLM I am traveling through to find out about burn bans and plan accordingly....and eat in town if there is ban where I am headed for the night or buy a cold sandwich to carry. Meat--on these big rides out of state, I bring my first steak with me, frozen. Throw it in the freezer wherever I am that first night at a motel or KOA leaving my truck for the week. Next day, the steak will easily hold all day for that first night camping off the bike. After that, I only buy a steak when hitting that last town prior to camping. It will hold for hours in your backpack, packed close to your 3L bladder.....that I always put ice in at every stop (this is your ice chest!!). I also like doing tortilla wraps with hot dogs or precooked bratts, they can last for hours in a backpack under same condition, really all day. And you can eat cold/or in foil next to your engine if you can't have a fire. A couple pieces of foil is handy and doesn't take up much room. Breakfast, I just do a dry bar, sometimes I will buy two gas station sandwiches the day before....or if getting fancy a gas station wrap!! Lunch, jerky/trail mix or gas station sandwich, occasionally a hot meal if passing through a town and place looks cool. Only carry enough snacks with you for a day or two, replenish when you hit a town. MREs and Town House meals take up a lot of room along with stoves....and I can eat a gas station sandwich for much cheaper.....and lighter.....and faster. I carry a couple catchup sized Gu Energy packs for emergencies or really hot days, game changer, I like the strawberry banana ones. Remember, pretty much all BDRs....you can replenish anything you need every 24 hours along the way when you get fuel for the bike. And I got in the habit of snagging some hot sauce and mustard pacs that are free at every gas station, works in tortillas with just about anything. I bring a zip lock baggy of dry rub seasoning as well, takes up no room and store with my couple pieces of foil.
Clothes, I am to the point I don't carry much at all, the stuff on my back, one short sleeve shirt/shorts with flops for off the bike. Two spare underwear/socks. I tried wearing two pair of underwear, but that was going too far....or was it? You can wash your clothes when you get to camp/motel, even if just in an empty ice bag. I carry baby liquid detergent for this. Jackets/Coats--I bring a fox rain jacket, the rest is layer stuff. I don't want to make room for bulky cold weather jackets, not used enough on these trips for me. Sometimes I am cold the first hour or two of riding in high elevations in the 30s or 40s, just pick a harder trail and warm up
. I would rather be light/tight 80-90 % of the day than warm and cozy for the first hour or two with a bulky bike all day. Hand harmers are also one of my tricks. If my feet and hands aren't cold, I tell the rest of my wimpy body to shut up. That and ride slower the first hour or two to lower the wind chill.
Tools/Tubes, yes you have to have them. If you are 21/18, you can carry one thin 21 and get by as was said. Most of my flats, patches have worked just fine. Tools, work on your bike at home to get this tool kit slimmed down with only essentials. I have a Nelson Rigg small tool roll and one bag I call the McGyver bag that is a bank cash bag with odds and ends like electrical connectors, spare bolts/nuts, spark plug. Spare levers and foot shifter are stuffed into my air box. I quit carrying chain lube. That can be a rabbit hole, but for the most part your chain is fine on the parts that matter....the part you see, get a baby wd40 if it makes you happy or half way on trip, buy one, use it, throw it away. Spare oil, I carried it on the 701 cause it would burn a little. My other two bikes, Africa Twin and 500, they don't use any. So a quart is crazy big. I went to refilling a two stroke oil baby container just to have a smig. I carry JB weld in case a case gets a hole.....and hope you find it quick! I would get the best skid plate with side protection as well. Buying oil at a gas station would cover most situations. I zip tie a leatherman style multi tool to my front forks, good place to store it and quick access.
Camping--separate your tent into different bags, helps reduce bulk. Put your sleeping bag up high on the very back, keeps all your heavy stuff down low/further forward. Sleeping pad, Klymit Static V is good compromise on comfort/packing size. Chair, I quit bothering. Too many times there was make shift chair possibilities, a picnic table....or I didn't want to mess with putting it together and carried it for nothing. Do a couple baby trips. Anything you didn't use, put it in a pile and really think about its need (non-tool stuff). Here is a pic of my first BDR packing setup (too much stuff), and a pic of my most recent BDR setup after learning/culling to get light. Both bikes were packed for a week's worth. I like stashing stuff all around the bike vs. just rear bags and big top bag and tank bag. Part of my tent is on the handlebars. I put some of my light weight clothes in a Biltwell bag above my headlight. I run 18" tires front/rear, so I have one spare thin 18" tube in the front fender bag along with two tire irons, hand pump, parachute cord and multi tool screw driver. I won't ride with too much bulk around me/behind me anymore. Best way to get there, buy a small bag setup, then you have to cull. I did things the opposite when I started out, bought bags that would carry all the crap I thought I had to have. You can listen to advise here and implement some stuff but you will only get there by doing and customizing for your needs. Have fun brother!!!