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Montbell Thunder Pass Hat vs Sea to Summit Ultra-Sil Sack 4L

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

Sea to Summit Ultra-Sil Sack 4L is the lighter option — 31 g lighter than the Montbell Thunder Pass Hat (56% less weight). If grams matter to you, that is the one to beat.
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Spec Montbell Thunder Pass Hat Sea to Summit Ultra-Sil Sack 4L
Weight 55 g · 0.055 kg · 0.12 lb 24 g · 0.024 kg · 0.05 lb
Brand Montbell Sea to Summit
Category Miscellaneous Miscellaneous
Montbell Thunder Pass Hat
55 g

Ultralight packable sun hat with Gore-Tex brim.

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Sea to Summit Ultra-Sil Sack 4L
24 g

Ultralight stuff sack for food, clothing or sleeping bag.

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Montbell Thunder Pass Hat vs Sea to Summit Ultra-Sil Sack 4L: which should you buy?

If saving weight is your priority, the Sea to Summit Ultra-Sil Sack 4L wins — at 24 g it is 31 g (56%) lighter than the Montbell Thunder Pass Hat (55 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 miscellaneous page, or browse the full gear weight database.

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