Peak Performance Hydration
Advanced vacuum insulation technology keeps your drinks ice-cold for 24 hours or piping hot for 12 hours. Built for athletes who demand excellence.
Built for Peak Performance
Every feature engineered for athletes who push their limits every single day.
Advanced Insulation
Double-wall vacuum insulation maintains temperature for up to 24 hours
Military-Grade Build
18/8 stainless steel construction withstands the toughest conditions
Quick-Access Lid
One-handed operation with secure lock mechanism for active lifestyles
All-Day Hydration
Large capacity options keep you hydrated through your longest workouts
100% Leak-Proof
Engineered seal prevents spills in your gym bag or backpack
Lifetime Warranty
We stand behind our products with comprehensive lifetime coverage
Cutting-Edge Technology
Our proprietary ThermaShield™ technology combines advanced materials science with precision engineering.
Triple-Layer Insulation
Copper-lined vacuum chamber with reflective heat barrier
Medical-Grade Steel
BPA-free 18/8 stainless steel that's taste-neutral and durable
Powder-Coated Exterior
Scratch-resistant finish with superior grip in all conditions
Precision Threading
CNC-machined threads ensure perfect seal every time
Choose Your Perfect Bottle
From gym sessions to mountain peaks, we have the perfect size for every adventure.
Elite 750
750ml / 25oz
- Perfect for workouts
- Fits standard holders
- Compact design
Pro 1000
1000ml / 32oz
- Most popular
- All-day hydration
- Wide mouth opening
Ultra 1500
1500ml / 50oz
- Maximum capacity
- Built-in handle
- Adventure ready
Why Athletes Choose Hard-Buki
See how we stack up against the competition.
| Feature | Hard-Buki | Brand A | Brand B |
|---|---|---|---|
| Cold Retention | 24 hours | 18 hours | 12 hours |
| Hot Retention | 12 hours | 8 hours | 6 hours |
| Material | 18/8 Steel | 18/8 Steel | Aluminum |
| Leak-Proof | — | ||
| Lifetime Warranty | — | — | |
| BPA-Free |
Trusted by Athletes Worldwide
"The Elite 750 is perfect for my training runs. Keeps my water ice-cold even in summer heat."
"I recommend Hard-Buki to all my athletes. The durability and performance are unmatched."
"The Ultra 1500 has been with me on countless adventures. Reliable in extreme conditions."
Built by Athletes, for Athletes
Founded in 2018 by professional endurance athletes, Hard-Buki was born from a simple frustration: existing water bottles couldn't keep up with serious training demands.
We set out to engineer the ultimate sports thermos—one that could withstand brutal workouts, extreme temperatures, and years of daily use while maintaining peak performance.
Today, Hard-Buki is trusted by professional athletes, outdoor enthusiasts, and everyday warriors who refuse to compromise on quality. Every bottle we create upholds our commitment to exceptional craftsmanship and innovation.