Why Internal Storage Matters for Bikepacking
Traditional bikepacking setups require frame bags, top tube bags, and saddle packs — all of which add weight and affect aerodynamics. Mondince's FM316 and FM326 gravel frames solve this problem with integrated downtube storage that keeps your essentials secure and out of the wind.
In this guide, we'll explore how internal storage frames can transform your bikepacking experience, compare FM316 vs FM326, and help you choose the right frame for your adventure needs.
What is Internal Downtube Storage?
Internal downtube storage is a hollow compartment built into the frame's downtube. Accessible via a watertight hatch, this space allows you to store tools, tubes, snacks, or even a lightweight jacket without needing external bags.
Benefits of Internal Storage:
- Aerodynamics: No bag flapping in the wind
- Security: Tools can't fall out on rough terrain
- Clean Aesthetics: Maintains the bike's clean lines
- Weight Distribution: Centralizes heavy items
- Protection: Gear stays dry and clean
Mondince Internal Storage Gravel Frames
Mondince offers two premium gravel frames with integrated downtube storage: the FM316 and FM326. Here's how they compare:
| Specification | FM316 | FM326 |
|---|---|---|
| Frame Weight (Size M) | 1150g | 1180g |
| Storage Volume | 0.8L | 1.2L |
| Tire Clearance | 50mm | 50mm |
| Mounting Points | 6 | 8 |
| Best For | All-day adventures | Multi-day expeditions |
FM316: The Adventure All-Rounder
The FM316 is designed for riders who want internal storage without compromising on weight or ride quality. At 1150g, it's lightweight enough for climbing yet durable enough for rough terrain.
Ideal For:
- Weekend bikepacking trips
- All-day gravel adventures
- Riders who want storage for essentials only
- Fast-paced group rides with gear
Storage Capacity:
- Multi-tool + tire levers + CO2 canister
- Spare tube (up to 700x45c)
- Energy gels or bars
- Phone or wallet
FM326: The Expedition Ready Frame
The FM326 features expanded storage volume (1.2L) and additional mounting points for serious bikepackers. At 1180g, it's slightly heavier but offers significantly more cargo capacity.
Ideal For:
- Multi-day bikepacking expeditions
- Self-supported touring
- Riders carrying full tool kits
- Remote adventures with limited resupply
Storage Capacity:
- Complete tool kit + spare tube + pump
- Rain jacket or lightweight layer
- First aid kit
- Snacks for full day
- Power bank + cables
How to Use Internal Storage Effectively
What to Store Inside:
- Always store: Multi-tool, tire levers, CO2/inflator, spare tube
- Good for: Snacks, phone, wallet, keys, lightweight jacket
- Avoid storing: Hydration packs (use bottles), electronics without padding
Packing Tips:
- Wrap metal tools in a cloth to prevent rattling
- Use small stuff sacks to organize items
- Check the hatch seal before wet rides
- Keep frequently used items accessible
Additional Mounting Points
Both frames feature multiple mounting points for traditional bikepacking bags when you need extra capacity:
- Top tube: Bolt-on top tube bag mounts
- Downtube: Three bottle cage mounts
- Seat tube: Mount for pump or bottle
- Fork: Three-pack mounts on each leg (FM326 only)
- Rear rack: Mounts for rack and fenders
Bikepacking Trip Types
Weekend Overnighter (FM316)
- Internal storage: Tools, tube, snacks
- Saddle pack: Sleeping bag, clothes
- Handlebar roll: Tent, sleeping pad
- Frame bag: Food, stove, electronics
5-Day Expedition (FM326)
- Internal storage: Tool kit, first aid, power bank
- Saddle pack: Sleeping system, extra clothes
- Handlebar roll: Tent, sleeping pad, camp shoes
- Frame bag: Food for 5 days, stove, fuel
- Fork bags: Water filter, spare parts
Frequently Asked Questions
Is the internal storage compartment waterproof?
Yes, both FM316 and FM326 feature watertight hatches with rubber seals. The compartments are fully waterproof, keeping your gear dry even in heavy rain or river crossings.
Can I access the storage while riding?
Yes, the hatch opens easily with one hand. However, we recommend accessing it while stopped for safety.
Does internal storage affect frame stiffness?
No. Mondince engineers have optimized the carbon layup around the storage compartment to maintain torsional stiffness. The FM316 and FM326 meet the same stiffness standards as non-storage frames.
Can I custom paint frames with internal storage?
Yes, custom painting is available for both FM316 and FM326 with a minimum order of 20 frames. The storage hatch can be color-matched to the frame.
What's the warranty on internal storage frames?
Both frames come with a 2-year warranty against manufacturing defects, including the storage hatch mechanism.
Conclusion
The FM316 and FM326 represent the future of bikepacking — integrated storage that keeps your gear secure without compromising aerodynamics or aesthetics.
Choose FM316 if: You want lightweight internal storage for weekend adventures and essential tools.
Choose FM326 if: You plan multi-day expeditions and need maximum storage capacity and mounting options.
Ready for your next bikepacking adventure? Contact our sales team for pricing, or inquire about OEM partnerships for custom frame orders.