
NEMO
Disco 15 Series
Spacious spoon shape, but bulky and inconsistent warmth.

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All of these suggestions are really junky except maybe the mat though. It's not like you couldn't go backpacking with them, but you could go much lighter without paying that much more. Borah bug bivy + 7x9 tarp: $184, ~15oz 3FUL Qidian Pro pack: $92, ~31oz CCF pad, whatever is cheapest around R2: ~$30 Ice flame quilt: $100-200 depending on rating You'll be out the door around $400-500 for the big 3, with a weight that should be well under 5 lbs, and nothing that you'll end up with zero use for later once you upgrade a bit.
Yeah I agree with you on the tent, it's a lot more comfy for most beginners. The 1/8" ground sheet is a solid idea too, though I do also think the eggcrate CCF pads are also great in combination with an inflatable, since they provide a more comprehensive backup in the case of inflation failure, and they also function as a sit/kneeling pad. Tons of ways you could go as a beginner. The right idea is to buy stuff which won't immediately become obsolete once you decide to throw a bit more money at the hobby.
I agree that these are reasonable suggestions, and that a Kelty sleeping bag, let alone an Ozark trail tent, is not. Though for a novice (who hasn't expressed interest in UL) I would probably guide them to an actual tent, like something in the lanshan series. Or a SMD gatewood Cape if she/he may go in the ultralight direction I'd also suggest going in the multi-use direction from the start. Get a 1/8" foam pad and one of it's many uses is under the tent as a ground sheet. Then a light/cheap inflatable pad (https://www.amazon.com/Sleepingo-Camping-Sleeping-Pad-Backpacking/dp/B07FP4Z3RZ/) inside the tent on top of it will round out the comfort/warmth equation for about the same price (later, when the ul bug strikes, you can cut down the inflatable to torso length, weld it shut with a clothes iron, and use your pack under your feet) But this is more preference than right/wrong compared to your list
You can absolutely piece together a Big 3 set for around $300 or less that'll be totally fine for shorter hikes in good weather. It's still worth avoiding no-name brands when you can, but here's a quick sketch of one: Kelty 20⁰ synthetic bag: $80, 3lbs 2oz ALPS CCF mat: $30, 10oz Ozark Trail 1p tent: $80, 4.1lbs REI Trailmade 60 pack: $125, 3lbs 6 oz This is already over 10lbs with just these items, so it's not exactly ultralight. However, this plus a cheap stove/pot setup, headlamp, and some items from around the house, and you're a good chunk of the way to a complete kit. The price skyrockets pretty rapidly once you start wanting to shave ounces, get more compressible insulation, or survive more extreme conditions. That's why mid-tier and top-of-the-line gear is so pricey, it's functionality at a lighter weight (plus relative lack of demand for expensive UL gear) that drives it up. If you don't know how much you'll use your gear, better to get something cheap at first, then if it wears out or you get sick of the compromises, you can always upgrade later. "Buy once, cry once" is only good advice if you already know you'll use what you're buying consistently.
I love my Kelty Cosmic Synthetic 20F
For casual three-season camping around 0°C, synthetic’s way easier on the wallet. Marmot Trestles or Kelty Cosmic Down alternative bags hold up fine, and you don’t freak out about melting water or sweat ruining insulation.
The RTIC 32 or 45, Igloo BMX 30 or Lifetime 28–55 (on the smaller end) all make sense for a cooler considering your space. These would hold ice for multiple days, have some decent lid seals and don’t waste internal volume the way Yeti does with overly thick walls. RTIC is probably the best among them though so that’s that! For the sleeping bag, keep it simple and three-season. Solid options - REI Co-op Trailbreak 20 or 30, Kelty Cosmic Synthetic 20 or Marmot Trestles 30. All of these pack reasonably small for a synthetic bag are warm enough for shoulder seasons and don’t feel like overkill. Other ideas? - merino wool sock gift set - gaiters for muddy or snowy trails - foot care set (creams + protective socks) - hat clip or sunglasses retainer - packable camping pillow - lightweight hammock with straps - sit pad for breaks - bug net hat - quality moisture-wicking base layers - hiking hat with sun protection - lightweight gloves for cool mornings - buff or neck gaiter And goes and on and on but this should be a good start for ya! Otherwise https://alaskanarrows.com/50-coolest-gifts-for-outdoorsmen/ for others

NEMO
Disco 15 Series
Spacious spoon shape, but bulky and inconsistent warmth.
Hammock Gear
Classic Burrow 20°F
Budget-friendly quilt; very warm, but not ultralight.

NEMO
Disco 30
Roomy spoon shape, but bulky and prone to zipper snags.

Katabatic Gear
Alsek 22°F Quilt
Premium quality, very warm, but high price for weight.

Neve Gear
Waratah
Great warmth-to-weight and value, but untreated down.

Ranked #1
NEMO - Disco 15 Series

Ranked #1
Kelty - Tru.Comfort Doublewide 20
Ranked #1
Enlightened Equipment - Revelation APEX

Ranked #1
NEMO - Disco 15 Series
Ranked #1
Hammock Gear - Classic Burrow 20°F

Ranked #1
NEMO - Disco 15 Series