Reddit reviews S.O.L. Survive Outdoors Longer Slim Rescue Howler Whistle (2-Count), Orange, Model:AD0010

Newbie to MTB but highly experience backpacker. Similar scenarios, limited access to medical evac. I've come to only carry the following as it contains everything you frequently need and nothing you think you need:

• Leukotape (better than moleskin; tough; stretches; waterproof adhesive; breathable so your skin doesn't macerate like under duct tape)
  
• Band-aids for minor scrapes
  
• Alcohol pads or alcohol disinfectant liquid soap (better: tincture of iodine since it can aid sticking adhesives)
  
• Tweezer (thorns, needles, splinters, ticks)
  
• Swiss Army knife classic (small and lightweight; highly useful features)
  
• Sterile gauze pads
  
• Chap stick (surprisingly useful)
  
• Dr. Bronner's biodegradable soap in old Visine dropper bottle
  
• oxycodone or Vicodin
  
• Ibuprofen
  
• Anti-diarrhea pills (mostly for week+ treks, probably not applicable for MTB)
  
  All this fits in a mini-ziplock baggie the size of your palm. You can also add pealess whistles if you break a bone and need to alert passerby's. And always carry a LED keychain light and/or charged cell phone.

These are relatively inexpensive, but cool to have items:

Long Handled grill basket

Collapsible solar light

personal water filter

Haul and hang kitchen organizer

Daypack There's nothing special about this particular one, but every car camper needs a daypack for hiking.

Battery pack for charging small electronics

Weatherproof matches

Hiker's Emergency whistle

Mosquito head net

Hydration bladder

Collapsible water jug

Condiment squeeze bottles (for more efficient cooler packing)

A bottle of this https://www.soylent.com/product/drink/ which I usually end up drinking.

A small bag of these https://www.amazon.com/gp/product/B009L4VF28/ref=oh_aui_detailpage_o08_s01?ie=UTF8&psc=1 and I usually end up eating 3-4 of them 10 minutes before I land.

Yellow lens prescription sunglasses to switch to when clouds get heavy

Lot of stuff that I hope I never use:

An Inreach http://www.cabelas.com/product/DeLorme-InReach-Explorer-Satellite-Communicator-with-Navigation/1926518.uts?productVariantId=4039506&WT.tsrc=PPC&WT.mc_id=GoogleProductAds&WT.z_mc_id1=04052766&rid=20&gclid=CjwKCAjw3rfOBRBJEiwAam-GsKtsg5u-ch9G5ZCvazBt-k0IJKdDFfIuATcalF66r3rdYvPKvUlY4RoCZE4QAvD_BwE&gclsrc=aw.ds

A SOLO escape bivvy sack https://www.amazon.com/gp/product/B0075ZS096/ref=oh_aui_detailpage_o00_s00?ie=UTF8&th=1

A whistle https://www.amazon.com/gp/product/B004Q17CQY/ref=oh_aui_detailpage_o00_s02?ie=UTF8&psc=1

A signal mirror

A handheld aviation radio

A compass

A flip phone with spare battery

About eight pounds of rain and cold weather gear.

Misc survival gear.

Not the shape or material you described, but I keep one of these on mine and my wife's keychains. Small light, and loud as... something really loud. Also cheap.

For that price you won't be getting ultralight on the big 3: backpack, sleeping bag, and tent. Unfortunately those are the largest, heaviest, and most difficult to go light weight on a budget. The majority of the other items are pretty good UL gear. You can, for example, get a lighter titanium stove. It'll save you about 2oz and double the cost. Eventually the 2oz there and a few more oz here and there on a number of pieces of gear really add up so you may want to swap it out as you upgrade your gear over time. But for right now one in the price/weight range I suggested is really good ultra light weight bang for your buck.

1. Alice Backpack $35 -- Watch some youtube videos on how to strap your tent/sleeping bag/sleeping pad to the pack safely and securely. Alternatively buy a used backpack off Craigslist for dirt cheap. This is the third thing I'd upgrade, once you have a lighter/smaller sleeping bag and tent.
   
2. Slumberjack 40 degree sleeping bag $98 -- Upgrade to down-filled rather than synthetic if you can, also make sure it's temperature appropriate for your trips. This is the first place I'd personally choose to upgrade.
   
3. Coleman Sundome $36 -- Any name brand dome tent is great for beginners. I picked a 2-person since you don't seem to know what you're doing (not an insult) I assume you'll be bringing a buddy! This is the 2nd thing I'd personally choose to upgrade to something that compacts down small enough to fit inside my backpack.
   
4. MSR Pocket Rocket butane stove $32 -- Not the greatest or the absolute lightest, but one of the more popular light weight stoves. A can of fuel is $5 at Wal-Mart or pretty much any sporting goods store.
   
5. Primus Litech 10oz kettle $25-- From this kit you really just want the pot and lid. You can leave the pan at home. According to the ad it is big enough to hold the 230g sized butane cannister previously mentioned. I suggest either eating things that require no cooking or just boiling water like any number of Mountain House or alternative meals available in the sporting goods section of Wal-Mart or any sporting goods store.
   
6. Stansport Back Packing Pad $10 -- One of the simplest items to upgrade, but "nicer" ones are $30-100+.
   
7. Titanium Spork $9 -- The only cookware you'll need for most those backpacking freeze-dried meals where you just add hot water and eat out of the pouch.
   
8. 4-pack of ponchos $4 -- These are stupid small and light. They're shit quality and rip easy so they're mostly one time use.. but at $1/ea you can pack one per day, who cares? Nice rain gear is hella expensive.
   
9. Base Layer -- If you don't already own it, buy some polyester/spandex "athletic" under-shirts and pants. They're stupid light, wick away your sweat, and add lots of warmth per ounce and cubic inch of pack space. I picked up a random set from Ross yesterday (bottoms and short sleeve top) for $20 combined. Generally speaking, avoid cotton for all clothing.
   
10. Rip-Stop/hiking/tactical pants $40/pair -- I can't pick these out for you because sizing/style preference, but the fairly cheap ones are about that price per pair.
    
11. AMK First Aid Kit $23 -- This is likely way more than you need and you could probably put together a decent one in a zip-loc baggy with stuff you have around the house. Don't forget to add any prescriptions you have or anything for special needs (allergies).
    
12. Survival Whistle $6 -- You can find cheaper ones at Wal-Mart maybe...
    
13. Signal Mirror $8 -- A woman's "compact" makeup mirror could get you this for free
    
14. Aquamira water treatment drops $14 -- You may also prefer iodine tablets or a filter. You can get a basic Sawyer filter from Wal-Mart for about $25.
    
    That totals out at $365 and covers most of your bases of things you'll need to buy. Most everything else is going to be like soap, toothbrush, etc. which I'm assuming you already have. I really like the HikeLight 3-day camping checklist. You won't be able to get most (any?) of the gear on this list at your price range, but just make sure you have a comparable replacement. Yours will likely just be bigger and/or heavier than their suggested ones. http://hikelight.com/gearlist.html
    
    Happy backpacking!