Key Facts: Camping Gear
This page is Basecamp Lab's maintained fact reference — the tested-spec facts our guides are built on, restated in plain prose. We report what gear is rated or tested to, never a safety guarantee for your specific trip.
Sleeping pad R-value
R-value measures a sleeping pad's resistance to heat loss into the ground, and it is additive when pads are stacked — a 2.6 R-value foam pad under a 4.2 R-value inflatable gives a combined ~6.8, a real winter-camping strategy. Most major brands now test to the shared ASTM F3340 standard, which made cross-brand comparisons meaningful for the first time — always check a listing cites it. Full guide: What R-Value Do I Need?
Sleeping bag temperature ratings
Bags tested to ISO 23537 (successor to EN 13537) publish two numbers: a comfort rating (average cold-sleeping woman, relaxed) and a lower limit rating (average warm-sleeping man, curled, at the edge of tolerable cold). The number marketed biggest on the bag is usually the limit rating — survival, not comfort. Untested bags carry only a manufacturer estimate. More in Are Sleeping Bag Temp Ratings Accurate?
Tent hydrostatic head
Hydrostatic head (mm) measures how tall a water column a fabric resists before leaking. Rough bands: under ~1,000mm is showerproof at best; ~1,500-2,000mm handles moderate rain; 3,000mm+ handles sustained heavy rain. It measures fabric only — most real leaks happen at seams and zippers, not through the coated fabric. See What Hydrostatic Head Is Waterproof Enough? and Tent for Rain Checklist.
3-season vs 4-season tents
"3-season" and "4-season" describe design intent, not a literal season count. 3-season tents use mesh panels and lighter poles for ventilation in mild weather; 4-season tents trade mesh for solid fabric and a stronger geodesic structure to handle snow load and high wind — and are heavier and hotter as a direct result. Full breakdown: 3-Season vs 4-Season Tents.
Headlamp lumens
A lumen figure only means something if it's independently tested to ANSI FL1, which also standardizes runtime, beam distance, and water/impact resistance. An untested lumen claim can reflect best-case lab conditions. Low-mode runtime — not peak lumens — usually determines whether a headlamp survives a multi-night trip. More in How Many Lumens for Camping?
Backpack sizing
Backpack volume should match trip length and season: roughly 20-35L for a day hike, 40-50L for 1-3 nights in mild weather, 50-65L for 3-5 nights or shoulder-season gear, and 65L+ for winter or bear-canister trips. A bigger pack than the trip needs tends to result in genuine overpacking. See What Size Backpack for a Weekend?
Canister stove BTU and cold weather
Canister-stove BTU/hr and boil-time claims are almost always measured indoors, in still air, at moderate temperature — real wind and cold both slow real-world boils, because canister output depends on the fuel's own vapor pressure, which falls as the canister cools. Liquid-fuel stoves (pumped, not vapor-pressure driven) hold up far better in genuine cold. See Canister vs Liquid Fuel Stoves.
How these facts are maintained
These facts are drawn from published ISO/ASTM/ANSI standard summaries and manufacturer specifications, reviewed against our guides and updated on the date shown above when standards or the market change. We do not publish prices or star ratings, every pick names an honest drawback, and we report tested/rated facts — never a safety guarantee for a specific trip, weather, or physiology. Our full methodology is at How We Evaluate Camping Gear.