
WATERFLY 20L Small Packable Hiking Daypack
You need a smaller extra backpack to unfold for selected day outings.
BRAND FIELD GUIDE · 4 MODELS
WATERFLY offers several ways to carry a smaller everyday or outdoor load, including running belts, waist bags, crossbody bags and backpacks. Its TransformerX collection includes packable designs, a useful distinction for travelers who want a second bag that takes less space when stored. The reviewed TransformerX 6.0 backpack is listed at 25 liters and 0.6 pounds, with a nylon main fabric and polyester lining. It also publishes folded dimensions, making the storage tradeoff easier to judge than a simple lightweight label. Compare those details with how much structure and organization you need for the intended load. Specifications describe this particular model; they should not be applied automatically to WATERFLY’s slings or other backpack families.
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No load-comfort or water-ingress testing performed.
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You need a smaller extra backpack to unfold for selected day outings.

You prefer a single-strap carrying format for a selected set of personal items.

Your spare daypack needs a stated 30-liter volume for a fuller outing load.

You want a sling-format personal bag that can be stored away when not in use.
Brand research by John Morris. Catalog checked September 10, 2026. Model pages distinguish listing claims from buying guidance.