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Nalgene HDPE 1.5L Waterbottlr 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 — 128 g lighter than the Nalgene HDPE 1.5L Waterbottlr (84% less weight). If grams matter to you, that is the one to beat.
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Spec Nalgene HDPE 1.5L Waterbottlr Sea to Summit Ultra-Sil Sack 4L
Weight 152 g · 0.152 kg · 0.34 lb 24 g · 0.024 kg · 0.05 lb
Brand Nalgene Sea to Summit
Category Miscellaneous Miscellaneous
Sea to Summit Ultra-Sil Sack 4L
24 g

Ultralight stuff sack for food, clothing or sleeping bag.

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Nalgene HDPE 1.5L Waterbottlr 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 128 g (84%) lighter than the Nalgene HDPE 1.5L Waterbottlr (152 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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