Xact Carb Scaled Soft Flask

Eliminate Mid-Race Math and Lock In Your Fuelling Strategy

When you are deep in the pain cave, grinding out a self-supported FKT attempt or navigating the technical, root-choked singletrack of the Musquodoboit Trailway, your brain is starved for glucose. The last thing you need to be doing is struggling with complex conversion factors. Standard soft flasks measure volume in millilitres or ounces, which is entirely useless when you are trying to calculate your exact hourly energy intake. The Xact Carb Scaled Soft Flask completely solves this problem by speaking the only language that actually matters to an endurance athlete: grams of carbohydrates.

This durable, reusable flask features a high-visibility, precision-engineered carbohydrate scale marked explicitly at 30g, 60g, 90g, 120g, and 150g increments. Instead of guessing how much fuel you have left in your vest, you simply fill the flask to your specific target for the training block and execute your pacing plan. Whether you are aiming for a baseline 60g per hour for a shorter trail interval or aggressively pushing the upper limits at 90g to 120g per hour for a grueling ultra-marathon, you can audit your intake at a single glance without slowing down your stride.

While engineered to match perfectly with Xact Bulk Gel portions—where one full flask holds exactly five full servings—this versatile flask is entirely universal. It can be utilized with bulk endurance gels from any brand on the market, allowing you to dial in your custom nutrition setup effortlessly. Built to withstand the compression and abuse of rugged backcountry fastpacking, the soft body allows for a clean, efficient squeeze without any sticky trailside spillage. It is completely BPA-free, easy to hand-wash between weekend long runs, and fully recyclable once you have hammered it through countless seasons.

High-Performance Fuelling Features

• Precision Carbohydrate Scale: High-visibility markings at 30g, 60g, 90g, 120g, and 150g intervals eliminate mid-effort math and track exact energy reserves.
• Universal Gel Compatibility: Optimized for Xact Bulk Gel pouches, but fully compatible with any bulk endurance or energy gel brand.
• Spill-Free Easy Squeeze: Pliable, rugged construction allows for fast, clean gel delivery even on highly unstable or technical terrain.
• BPA-Free & Reusable: Highly durable, non-toxic architecture built for repeated wash cycles and long-term backcountry reliability.
• Streamlined Vest Integration: A compact capacity of approximately 200ml allows it to slide seamlessly into standard running vest front pockets or fastpack shoulder sleeves.