Sea to Summit Ultra-Sil Sack 4L vs Zpacks Slim Dry Bag
Weight and specs compared for 2026 — and which one to choose.
Ultralight stuff sack for food, clothing or sleeping bag.
Full details →Ultra-lightweight dry bag for pack organization. Large size at only 0.4 oz.
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Sea to Summit Ultra-Sil Sack 4L vs Zpacks Slim Dry Bag: which should you buy?
If saving weight is your priority, the Zpacks Slim Dry Bag wins — at 11 g it is 13 g (54%) lighter than the Sea to Summit Ultra-Sil Sack 4L (24 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.