Alloy Seat Pack
Tailfin Alloy Seat Pack Review
Tested and reviewed for bikepacking use
Tailfin takes a different approach with an alloy sub-frame that connects to the seatpost and rear axle. This gives the seat pack rack-like stability with 20L of capacity and virtually zero sway, even on the roughest terrain.
Who Is the Tailfin Alloy Seat Pack Best For?
Riders who want maximum seat bag capacity with zero compromise on stability. If that describes your riding style, the Alloy Seat Pack should be at the top of your shortlist. It sits in the Seat Bags category alongside 9other products we've reviewed.
How It Compares
At 520g and $225, the Alloy Seat Pack is 184g heavier than the lightest option in this category (the Apidura Backcountry Saddle Pack at 336g). The most budget-friendly option is the Topeak BackLoader 10L at $70.
The price-to-weight ratio comes in at $43 per 100g — a premium price point, but you're paying for quality, materials, and design that justify the investment for serious bikepackers.
What We Like
- +Alloy frame eliminates all sway
- +20L is the largest in class
- +Rack-like stability on any terrain
- +Modular system — add panniers later
Watch Out For
- −Heavy and expensive
- −Alloy frame adds complexity
- −Overkill for lightweight setups
The Bottom Line
The Tailfin Alloy Seat Pack earns a 4.3/5 rating. It's a solid performer that does most things well. Alloy frame eliminates all sway is the standout feature, though heavy and expensive is worth considering before you buy.
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