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Sea to Summit Alto TR2 vs Zpacks Duplex

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

Zpacks Duplex is the lighter option — 550 g lighter than the Sea to Summit Alto TR2 (52% less weight). If grams matter to you, that is the one to beat.
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Spec Sea to Summit Alto TR2 Zpacks Duplex
Weight 1,060 g · 1.060 kg · 2.34 lb 510 g · 0.510 kg · 1.12 lb
Brand Sea to Summit Zpacks
Category Shelter Shelter
Sea to Summit Alto TR2
1,060 g

Ultralight 2-person tent with tension ridge architecture.

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Zpacks Duplex
510 g

Dyneema 2-person trekking pole shelter. Legendary ultralight option.

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Sea to Summit Alto TR2 vs Zpacks Duplex: which should you buy?

If saving weight is your priority, the Zpacks Duplex wins — at 510 g it is 550 g (52%) lighter than the Sea to Summit Alto TR2 (1,060 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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