Big Agnes Copper Spur Sizing Guide

Copper Spur HV UL: UL1 vs UL2 vs UL3

The honest sizing guide. Weight, floor space, vestibules, and the one mistake most buyers make when picking between the three Copper Spur sizes.

Jake ThorntonUpdated April 20269 min read

Which Copper Spur Size Should You Buy?

For most backpackers: the HV UL2 is the right answer regardless of whether you camp solo or with a partner. Solos get usable space and dual vestibules for an 11-ounce penalty over the UL1. Couples get a fits-but-tight 2-person tent. The UL3 is overkill unless you regularly camp with three people or share with a partner plus a dog.

The Big Agnes Copper Spur HV UL is one of the most-shopped ultralight backpacking tents on the market — and the most common mistake buyers make is sizing down to save weight without understanding what they give up. This guide compares all three sizes side-by-side using verified manufacturer specs and real-world livability notes from testing all three on multi-night trips.

#Quick Answer: Pick the Right Size

1.Solo + ounce-counter or budget-conscious: HV UL1. 2 lb 0 oz, $450.
2.Solo who values space, or couples: HV UL2. 2 lb 11 oz, $550. The right choice for 80% of buyers.
3.3 people, families, dog parents, generous-solo seekers: HV UL3. 3 lb 8 oz, $650.
4.Worth the price premium? Yes for 30+ nights/year backpackers. No for occasional campers — see the REI Half Dome instead.

Full Spec Comparison: UL1 vs UL2 vs UL3

Verified specs from Big Agnes' current product line. All three models use the same DAC Featherlite NSL pole architecture, double-wall construction, and 1200mm waterproof rating.

Spec	HV UL1	HV UL2	HV UL3
Capacity	1 person	2 person	3 person
Trail weight	2 lb 0 oz	2 lb 11 oz	3 lb 8 oz
Packed weight	2 lb 5 oz	3 lb 2 oz	4 lb 0 oz
Floor area	20 sq ft	29 sq ft	41 sq ft
Floor dimensions	88 x 38 in	88 x 52 in	90 x 70 in
Peak height	38 in	40 in	42 in
Vestibules	1 (9 sq ft)	2 (9 + 9 sq ft)	2 (9 + 9 sq ft)
Doors	1	2	2
Packed size	5.5 x 19 in	6 x 19.5 in	6.5 x 21 in
MSRP	$450	$550	$650
Best for	Solo ultralight thru-hikers, weight-obsessed soloists	Couples, solo with extra space, weekend backpackers	3-person trips, families, couples + dog, generous solo

Copper Spur HV UL1: Solo Specialist

The HV UL1 is built for one purpose: getting a single backpacker under shelter at the lowest possible weight while staying fully freestanding. At 2 lb 0 oz trail weight it competes directly with ultralight specialty tents (Zpacks Plex Solo, Tarptent Notch Li) while offering a more conventional double-wall design that forgives condensation mistakes better.

The 88 x 38-inch floor fits one regular-width sleeping pad with room for clothes alongside. The 38-inch peak height is enough to sit upright if you slouch — barely. The single vestibule provides 9 sq ft for boots, pack, and cooking gear, but the single door means you exit the tent through your gear at night.

Honest take: the UL1 is the right buy only if you have a clear ultralight target (sub-12-pound base weight) and are committed to soloing. For everyone else, the 11-ounce upgrade to the UL2 is one of the best value-per-ounce decisions in backpacking gear.

Copper Spur HV UL2: The Default Pick

The UL2 is one of the best-selling backpacking tents at any price point because it splits the difference between solo ultralight and couple-friendly perfectly. At 2 lb 11 oz, it adds just 11 ounces over the UL1 while delivering 9 more square feet of floor area, a 2-inch-taller peak, and crucially, dual vestibules and dual doors.

For couples: the 88 x 52-inch floor fits two regular-width pads snugly, with about 4-6 inches of clearance per side. Two adults taller than 6 feet will brush shoulders during the night, but the dual doors mean neither person climbs over the other for middle-of-the-night exits.

For solos using a UL2: you get a roomy single tent with two vestibules — one for gear, one for entry/exit — at the cost of 11 oz over the dedicated UL1. Many experienced solo backpackers prefer this configuration because it eliminates the cramped feel of single-person tents on multi-night trips.

For an in-depth product review of the UL2 specifically, see our Big Agnes Copper Spur HV UL2 review.

Copper Spur HV UL3: 3-Person Capable, 2-Person Generous

The UL3 expands floor area to 41 sq ft (90 x 70 inches) — enough for three regular pads side-by-side with no overlap. Peak height jumps to 42 inches, providing genuinely comfortable sit-up clearance. Trail weight increases to 3 lb 8 oz, which is 13 oz heavier than the UL2 and enough to push the tent out of "true ultralight" territory.

The legitimate 3-person use case is shorter than most buyers expect. Three adults in a UL3 will be comfortable but not luxurious — there's no extra room for gear inside, and the vestibule space (9+9 sq ft) gets crowded with three sets of boots and packs. Three people is doable; four people for short durations works in a pinch but is genuinely tight.

The honest 3-person situations: families with one young child, couples plus a 50+ pound dog, or three small-framed adults. For three adults regularly, look at 3-person tents with explicitly roomier dimensions like the Big Agnes Copper Spur HV UL3 MtnGLO+ (slightly more ventilated) or the Nemo Aurora 3P (more floor area, heavier).

The Sizing Mistake Most Buyers Make

The most common Copper Spur sizing mistake is using "1 person = UL1, 2 people = UL2, 3 people = UL3" as a hard rule. Big Agnes rates capacity by floor space alone, not livability. The actual sizing rule that more experienced backpackers use:

Buy one size up from your group count for any trip longer than 2 nights or any trip where space matters more than ounces.

For a solo backpacker on a thru-hike, the UL2 is the better tent after about night 4 — you're carrying 11 oz of extra weight for the entire trip in exchange for living in a tent that doesn't feel claustrophobic for 100+ nights. For couples on week-plus trips, the UL3 starts to make sense once you've spent enough nights in a UL2 to know that shoulder-brushing during sleep adds up.

The exception: if you're weight-targeted (sub-10-pound base weight, fastpacking, multi-day races), buy the smaller size. Every ounce matters more than livability when you're moving 25+ miles per day.

Who Should Buy Each Size

UL1 — Solo Specialist

•True ultralight target (sub-12-lb base weight)
•Tight budget — $100 less than UL2
•Camping on small platforms or constrained sites
•Trip lengths under 4 nights typically

UL2 — The Default

•Couples on weekend or multi-night trips
•Solos who value space over weight
•Most thru-hikers (best balance)
•Mixed solo + partner use

Recommended for 80% of buyers

UL3 — Spacious Group

•Regular 3-person trips (be honest)
•Couples + medium-to-large dog
•Family with one young child
•Long-trip couples wanting luxury

Frequently Asked Questions

What's the difference between Big Agnes Copper Spur HV UL1, UL2, and UL3?+

The HV UL1 is a single-person tent with 20 sq ft of floor area, 38-inch peak height, and a single vestibule. The HV UL2 fits 2 people in 29 sq ft, with 40-inch peak height and dual vestibules (one each side). The HV UL3 sleeps 3 in 41 sq ft, with 42-inch peak height and dual vestibules. Weight scales from 2 lb 0 oz (UL1) to 2 lb 11 oz (UL2) to 3 lb 8 oz (UL3). All three share the same DAC pole architecture, double-wall construction, and waterproof rating — the core engineering is identical, only floor area and capacity differ.

Should a solo backpacker buy the Copper Spur UL1 or UL2?+

Most solo backpackers should buy the UL2, not the UL1. The 11-ounce weight penalty (2 lb 0 oz vs 2 lb 11 oz) buys you 9 extra square feet of floor space, dual vestibules for gear and entry/exit flexibility, and a 2-inch taller peak height. On a multi-night trip the extra room makes a meaningful difference in livability. Choose the UL1 only if you are a true ounce-counter (sub-10-pound base weight target), have a tight budget that makes the $100 difference matter, or you frequently camp on tent platforms or sites where space is constrained.

Is the Copper Spur UL2 actually big enough for two adults?+

Yes, but barely. The 29 sq ft floor with 88-inch length and 52-inch shoulder width fits two adult-sized sleeping pads with no overlap, leaving roughly 4-6 inches of clearance on each side. Two 6-foot-plus campers will brush shoulders during the night. The dual doors and vestibules help significantly — each person has their own entry and gear storage, which improves livability more than the floor area suggests. Couples who want more elbow room or share a queen-sized double-wide pad should size up to the UL3.

When is the UL3 the right choice?+

Three legitimate reasons to buy the UL3: you genuinely camp with 3 people on a regular basis (most users overstate this and end up using a UL3 with two people), you and your partner want generous solo-tent-feel space when sharing, or you bring a dog along and need room for both adults and a 50+ pound dog. The weight penalty is significant — 3 lb 8 oz vs 2 lb 11 oz for the UL2 means an extra 13 oz in your pack. For 2 people most of the time and 3 people occasionally, the UL2 with one person sleeping outside their pad slightly off-center works better than carrying the UL3 weight every trip.

Is the Copper Spur worth the $550-650 price tag?+

For thru-hikers, weekend warriors covering 30+ nights per year, and any backpacker prioritizing weight, yes. The Copper Spur is one of the lightest fully freestanding double-wall tents at any price point, and the HV (high-volume) architecture gives it more interior space than competitors at the same weight. Cheaper alternatives like the REI Co-op Half Dome ($300) and the MSR Hubba Hubba ($530) are both heavier and either less spacious or less weather-resistant. If you camp fewer than 5 nights per year, the price premium is harder to justify — a $300 tent is plenty for occasional use.

What's the difference between Copper Spur HV UL and the older non-HV models?+

HV stands for High Volume. The HV variants (introduced in 2019) use a redesigned pole architecture that creates steeper sidewalls and higher peak heights compared to the original Copper Spur UL line. The HV UL2 has a 40-inch peak vs 39-inch on the older UL2, and the headroom feels significantly more generous because the walls go straighter up before tapering. Big Agnes also improved the door design and ventilation in the HV revision. If you are buying new, only HV models are sold — the older non-HV is discontinued. Used non-HV models go for $200-300 less and are still excellent tents, just less roomy.