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 — 120 g lighter than the Black Diamond Firstlight 2P (10% less weight). If grams matter to you, that is the one to beat.

Spec	Black Diamond Firstlight 2P	Sea to Summit Alto TR2
Weight	1,180 g · 1.180 kg · 2.60 lb	1,060 g · 1.060 kg · 2.34 lb
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.

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Sea to Summit Alto TR2

1,060 g

Ultralight 2-person tent with tension ridge architecture.

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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 1,060 g it is 120 g (10%) 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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