SoftFlask Speed 500ml vs SkyFlask Speed 500ml: Which HydraPak?
By HydraPak | Performance Hydration Reservoirs, Soft Flasks ... | Published: 2026-10-21
Category: Comparisons
Compare the HydraPak SoftFlask Speed 500ml and SkyFlask Speed 500ml for running. Learn key trade-offs like vest compatibility vs. handheld comfort to pick your ideal soft flask.
Quick answer
Choose the SoftFlask Speed 500ml if you run with a hydration vest or pack. Choose the SkyFlask Speed 500ml if you prefer carrying a soft flask by hand.
Vest compatibility or handheld freedom: the core difference
Both flasks hold 500 ml and use a SpeedFill flip top, but they serve different running styles. The SoftFlask Speed is shaped and pinch-welded to slide easily into vest pockets, while the SkyFlask Speed includes a thumb loop and adjustable strap for a secure hand carry. Your choice depends on whether you want to stow your flask or keep it in hand.
Weight is comparable — both are light — but the SkyFlask adds a neoprene loop and strap that the SoftFlask doesn't have. That extra material pays off for handheld runners but adds nothing for those who use a vest.
Trade-offs at a glance
- SoftFlask Speed 500ml: Best for vest and pack users: ensures quick pocket loading and fits most running hydration vests. Weighs only grams and has a self-sealing silicone bite valve.
- SkyFlask Speed 500ml: Best for handheld carry: ambidextrous thumb loop and adjustable, sweatproof strap keep the flask secure without squeezing. Works for both short and long runs in hand.
- Different tools for different setups: If you already own a vest or pack, the SoftFlask Speed is the obvious choice. If you don't want to carry a pack and prefer hand freedom, the SkyFlask gives you a comfortable handheld that doesn't slip. Decide based on your carrying method, not on capacity — both hold 500 ml.
Product facts
- SoftFlask™ Speed 500ml: Pinch-welded bottom and slim profile designed for compatibility with the widest range of vests and packs. It goes in and out of tight pockets without snagging, saving fiddly time during transitions or on the trail.
SoftFlask™ Speed 500ml - SkyFlask™ Speed 500ml: Innovative thumb loop allows holding the flask securely without wasting energy gripping or squeezing. You can run naturally with a relaxed hand, reducing fatigue on long runs where you'd otherwise clench a flask.
SkyFlask™ Speed 500ml
Which should you buy?
Best for
- Runners who use a hydration vest or pack and need a flask that loads and fits seamlessly.
- Trail runners or racers who want a lightweight, no-fuss flask that stows easily.
Not ideal for
- Runners who prefer carrying a flask in hand — the SkyFlask's thumb loop and strap offer better comfort and security.
