HydraPak UltraFlask Speed 600ml vs Katadyn BeFree AC Bottle 0.5L
Weight and specs compared for 2026 — and which one to choose.
Soft-sided water bottle at 2 oz (57g) designed for running hydration vests and ultralight backpacking with collapsible design.
Full details →Ultralight collapsible water filter bottle with activated carbon. Removes tannins and improves taste. Fits running vests and ultralight daypacks
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HydraPak UltraFlask Speed 600ml vs Katadyn BeFree AC Bottle 0.5L: which should you buy?
If saving weight is your priority, the HydraPak UltraFlask Speed 600ml wins — at 57 g it is 15 g (21%) lighter than the Katadyn BeFree AC Bottle 0.5L (72 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 hygiene page, or browse the full gear weight database.