1) Which FITLY Pack Is Right For Me?

👉 Sub45 = Everyday runs
👉 Sub90 = Hydration included
👉 Sub180 = Long runs & adventure days

Sub45

• Built to disappear while running.
• Carries essentials: phone, keys, nutrition and small items.
• No built-in hydration system.

Sub90

• Same compact fit as Sub45.
• Includes a hidden 500 ml hydration system.
• Larger rear storage.

Sub180

• Designed for longer outings and heavier loads.
• More front access, expandable rear storage and a 1.1 L bladder.
• Uses anchor points and triangulation for added stability.

2) Which size fits me?

Sub45 & Sub90 are available in two sizes.

Measure your chest approximately 2 inches (5 cm) below your pectoral muscles (or bra band line).

• XS–S: 26–31 in (67–78 cm)
• M–L–XL: 31–40 in (78–102 cm)

If you're between sizes, consider how you'll typically use the pack (T-shirt vs. winter layers).

Sub180 comes in one adjustable size that fits most body types:

• XS–XL: 24–48 in (60–121.5 cm)

For best results, adjust in this order: side straps → lower chest strap → upper chest strap.

3) How do I adjust my FITLY?

Proper adjustment takes less than 30 seconds and makes a big difference in comfort.

Sub45 & Sub90

• Position the thoracic belt about 2 in (5 cm) below your pectorals.
• The pack should feel snug, not tight.
• Too loose: items may bounce or shift.
• Too tight: breathing may feel restricted.

Sub180

• Adjust the side straps first.
• Then tighten the lower chest strap.
• Finish with the upper chest strap.

4) IMPORTANT: maintain your zippers.

Your pack's zippers work hard on every run. A little maintenance goes a long way.

With proper care, they'll last for years. Without it, dirt and salt can cause them to become stiff or jam.

👉 Read our zipper care guide. You'll be glad you did.  Click: blog

5) How do I wash my FITLY?

• Hand wash with mild soap and lukewarm water.
• After a run, a quick rinse in the shower is often enough.
• Hang upside down to dry.
• Avoid washing machines, which can damage the water-resistant coating.
• To speed up drying, stuff the pockets with paper towels.

6) How does the hydration system work?

Always rinse new flasks and bladders before first use. If any taste remains, soak in a baking soda solution for 15 minutes.

Sub90

• Includes a 500 ml bladder.
• Make sure the cap is fully tightened to maintain suction.
• Check that the flow stopper is open before drinking.

Sub180

• Includes a 1.1 L bladder.
• Route the tube through the shoulder straps.
• Leave a small gap where the tube exits the bladder to prevent blockage.
• Tighten the cap securely.

💡 Tip: Dry flasks upside down with a spoon inside to improve airflow and speed up drying.

7) I try to drink and nothing comes out, what am I doing wrong?

The two most common causes are:

• The flow stopper is closed.
• The tube is inserted too far into the flask, restricting water flow.

If both are correct, check that the cap is fully tightened to maintain proper suction.

8) Where can I store which flasks?

• 150 ml – Front pockets of all FITLY packs (except a full Sub90 XS–S).
• 250ml to 500ml – Rear pockets of all FITLY packs and upper front pocket of the Sub180.
• 500ml Bladder – Included with the Sub90. Fits the Sub90 thermo-pocket only.
• 1100ml – Included with the Sub180. Fits the Sub180 thermo-pocket only.
• 1700 ml – Standalone bladders compatible with the Sub180.

💡 Tip: The Sub45 is designed for light loads. Overpacking may increase bounce while running.