Igneous NOBO Water Bottle vs Sea to Summit Ultra-Sil Sack 4L
Weight and specs compared for 2026 — and which one to choose.
HDPE composition resisting microplastics versus traditional Smartwater bottles.
Full details →Ultralight stuff sack for food, clothing or sleeping bag.
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Igneous NOBO Water Bottle 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 41 g (63%) lighter than the Igneous NOBO Water Bottle (65 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.