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Nalgene HDPE 1.5L Waterbottlr vs Sea to Summit Ultra-Sil Daypack 20L

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

Sea to Summit Ultra-Sil Daypack 20L is the lighter option — 84 g lighter than the Nalgene HDPE 1.5L Waterbottlr (55% 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 Daypack 20L
Weight 152 g · 0.152 kg · 0.34 lb 68 g · 0.068 kg · 0.15 lb
Brand Nalgene Sea to Summit
Category Miscellaneous Miscellaneous
Sea to Summit Ultra-Sil Daypack 20L
68 g

Ultralight packable daypack. Stuffs into its own pouch.

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Nalgene HDPE 1.5L Waterbottlr vs Sea to Summit Ultra-Sil Daypack 20L: which should you buy?

If saving weight is your priority, the Sea to Summit Ultra-Sil Daypack 20L wins — at 68 g it is 84 g (55%) 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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