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Black Diamond Firstlight 2P vs Sea to Summit Alto TR2

Weight and specs compared for 2026 — and which one to choose.

Sea to Summit Alto TR2 is the lighter option — 24 g lighter than the Black Diamond Firstlight 2P (2% less weight). If grams matter to you, that is the one to beat.
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Spec Black Diamond Firstlight 2P Sea to Summit Alto TR2
Weight 1,180 g · 1.180 kg · 2.60 lb
as listed; page does not say whether minimum or packed weight
 1,156 g · 1.156 kg · 2.55 lb
minimum weight (Minimum Trail Weight), TR2 2-person
Brand Black Diamond Sea to Summit
Category Shelter Shelter
Black Diamond Firstlight 2P
1,180 g

Freestanding 2-person geodesic tent for 3-4 season use.

See it in your base weight → Full details →
Sea to Summit Alto TR2
1,156 g

Ultralight 2-person tent with tension ridge architecture.

See it in your base weight → Full details →

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Black Diamond Firstlight 2P vs Sea to Summit Alto TR2: which should you buy?

If saving weight is your priority, the Sea to Summit Alto TR2 wins — at 1,156 g it is 24 g (2%) lighter than the Black Diamond Firstlight 2P (1,180 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.

See where both rank against everything else in this category on the lightest shelter page, or browse the full gear weight database.

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