FLASK FIT FINDER
HydraPak is the trusted hydration partner of the world’s leading running brands. These brands rely on us to design high-performance hydration flasks that fit seamlessly in their running vests, belts, and packs. Simply put, our flasks fit over 90% of the gear in the market.
Whether you’re replacing an old flask, upgrading your gear, or adding an extra hydration solution, HydraPak’s Flask Fit Finder helps you select the perfect flask for your setup.
KEY FIT FACTORS
To ensure a comfortable, stable fit, finding the right flask for your running vest or belt comes down to three key considerations: pocket dimensions, pocket material, and flask style. The right fit means the flask sits securely, with no movement or risk of falling out. Use our Flask Fit Finder guide to help select your ideal flask based on your pocket size and preferred features.
STEP BY STEP FIT GUIDE
STEP 1:
MEASURE YOUR POCKET DIMENSIONS
Pocket Width and Depth: Measure the width and depth of your pocket, ensuring compatibility with the flask dimensions. We recommend measuring in centimeters or milimeters for ease.
Pocket Opening Width: Also measure the width of the pocket’s opening, especially if you’re considering a pinch-welded flask that will need to fit smoothly into tight spaces.
Pocket Width and Depth: Measure the width and depth of your pocket, ensuring compatibility with the flask dimensions. We recommend measuring in centimeters or milimeters for ease.
Pocket Opening Width: Also measure the width of the pocket’s opening, especially if you’re considering a pinch-welded flask that will need to fit smoothly into tight spaces.
STEP 2:
IDENTIFY YOUR POCKET MATERIAL & FIT PREFERENCE
Tight, Form-Fitting Pockets: These pockets often use stretchy fabrics that hug the flask. A pinch welded bottom allows easy insertion and is better suited for narrow pockets where the flask is pushed to the bottom.
Slightly looser, roomier pockets: Choose a 3D welded bottom to add stability to pockets with more room to keep flasks from moving around.
Tight, Form-Fitting Pockets: These pockets often use stretchy fabrics that hug the flask. A pinch welded bottom allows easy insertion and is better suited for narrow pockets where the flask is pushed to the bottom.
Slightly looser, roomier pockets: Choose a 3D welded bottom to add stability to pockets with more room to keep flasks from moving around.
STEP 3:
LENGTH AND PROFILE CHECK FOR COMFORT
Check Flask Length Against Pocket Height: Ensure the flask length doesn’t exceed the pocket height and allows for easy access. For running belts, longer and slimmer flasks are usually ideal to minimize skin irritation.
Slim Profile for Running Belts: When using a belt, opt for flasks with a flatter design, especially with pinch welded bottoms, for a comfortable horizontal fit.
Check Flask Length Against Pocket Height: Ensure the flask length doesn’t exceed the pocket height and allows for easy access. For running belts, longer and slimmer flasks are usually ideal to minimize skin irritation.
Slim Profile for Running Belts: When using a belt, opt for flasks with a flatter design, especially with pinch welded bottoms, for a comfortable horizontal fit.
COMPATIBILITY CHART
| FLASK | UltraFlask Speed 500ml | UltraFlask Speed 600ml |
SoftFlask Speed 500ml |
PocketFlask 500ml |
| SUGGESTED POCKET FIT* |
Width: 2-3in / 50-75mm Depth: 2-2.5in / 55-60mm Length: 6-7.5in / 150-200mm |
Width: 3-4in / 75-100mm Depth: 2-2.5in / 55-60mm Length: 6-7.5in / 150-200mm |
Width: 3-4in / 75-100mm Depth: 2-2.5in / 55-60mm Length: 8-9in / 210-230mm |
Width: 3-4in / 75-100mm Depth: 1.5-2in / 37-50mm Length: 9-10.5in / 230-265mm |
| CAPACITY | 500ml / 17oz | 600ml / 20oz | 500ml / 17oz | 500ml / 17oz |
| FLASK STYLE | 3D Welded | 3D Welded | Pinch Welded | Pinch Welded |
| LENGTH | 7.48in / 190mm | 7.48in / 190mm | 8.27in / 210mm | 9.06in / 230mm |
| WIDTH | 2.17in / 55mm | 3.15in / 80mm | 3.15in / 80mm | 3.15in / 80mm |
| DEPTH | 2.17in / 55mm | 2.17in / 55mm | 2.17in / 55mm | 1.46in / 37mm |
| CAP STYLE | SpeedFill | SpeedFill | SpeedFill | Twist Lock |
| CAP DIAMETER | 1.65in / 42mm | 1.65in / 42mm | 1.65in / 42mm | 1.1in / 28mm |
