Best Soft Flask for Running & Travel: Our Top Pick for Lightweight Hydration

If you’ve ever tried running with a bulky bottle in your hand or packing a rigid bottle into an already full backpack, you’ll know it’s less than ideal. That’s why soft flasks or soft water bottles have become a favourite among runners, hikers, and frequent travellers.

They’re lightweight, collapse as you drink, and pack down small — so you can stay hydrated without the hassle.

Why Soft Flasks Beat Hard Bottles

When it comes to running and travel, soft flasks offer some clear advantages:

• Lightweight: Carry only what you need, without the extra bulk.

• Compact: Fits in running vests, waist belts, or backpack side pockets.

• No Sloshing: The flexible design collapses as you drink.

• Travel-Friendly: Empty it before airport security, then refill once you’re through.

What to Look For in the Best Soft Flask

Whether you’re trail running, hiking, or travelling, a good soft flask should have:

1. Bite Valve: For quick, spill-free sips on the move.

2. Wide Lid Opening: Easy refills and simple powder mixing.

3. Clear Volume Markings: Helps you track fluid intake.

4. BPA-Free Materials: Safe for you, safe for the planet.

5. Colour Options: Useful for keeping drinks (like water and electrolytes) separate.

Our Top Pick: Roam 500 mL Soft Flask

Shop the Roam Soft Flask →

The Roam 500 mL Soft Flask is designed for movement, whether you’re chasing kilometres on the trail, exploring new cities, or packing light for an overseas trip.

Features we love:

• 500 mL capacity with an easy-drink bite valve

• Wide lid for quick refills and easy mixing with Roam Protein or electrolytes

• Grooved cap for grip, even with sweaty hands

• BPA-free with volume markings

• Two bright colours (blue and orange) so you can tell drinks apart at a glance

Running & Travel Tips for Your Soft Flask

• Match to Your Gear: Check flask pocket sizing in your vest or pack.

• Plan Your Hydration: Use one colour for water, one for sports drink.

• Keep It Clean: Rinse after every use, especially with sports drinks.

• Beat the Heat: Freeze half-full, then top up before you go.

The Bottom Line

If you’re after a lightweight, collapsible water bottle for running or travel, a soft flask is hard to beat. And the Roam 500 mL Soft Flask ticks every box — with practical features, bright colours, and a design made for movement.

Shop the Roam Soft Flask here.