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Will it work with a dropper post?
No. This pack attaches to the seatpost, so it needs exposed post to hold on to. Drop the post and the pack is in the way — that is the conflict, and no strap arrangement gets around it.
From how Restrap describe the attachment. See the source.
How much room does it need?
This pack measures 46cm long and 20cm deep. Length is how far it reaches behind your saddle, and it's what drives sway — a long pack is a longer lever on the seatpost. Depth is what competes with your rear tire once the pack sags under load.
Across the 18 seat packs we hold dimensions for — which run from 24cm to 67cm — this one reaches further back than 6 of them, and hangs deeper than 7.
The other number that decides this — how much seatpost you have showing above the collar — depends on your leg length rather than your frame, and makers almost never publish a minimum. So measure from the top of your seat collar to the bottom of your saddle rails, then check it against the mounting hardware on the product page. If you run a dropper post, look for a pack that mounts to the saddle rails alone.
Check against your measurementsRestrap Saddle Bag — Specs & Analysis
Manufacturer specifications, compared against every other seat bags in our database. We do not test gear in the field — we measure, verify, and compare.
Restrap's Saddle Bag is made in their Yorkshire workshop using waterproof welded fabric. The roll-top closure cinches down tight, and the dual mounting straps attach to both the seatpost and saddle rails for stability. The external daisy chain lets you lash extra items to the outside.
Who Is the Restrap Saddle Bag Best For?
Riders who want a handmade, waterproof seatpack with lashing versatility. If that describes your riding style, the Saddle Bag should be at the top of your shortlist. It sits in the Seat Bags category alongside 17 other products we track.
How It Compares
At 535g and $208, the Saddle Bag is 393g heavier than the lightest option in this category (the Revelate Designs ECOPAK Shrew Seat Bag at 142g). The most budget-friendly option is the Topeak BackLoader 10L at $70.
The price-to-weight ratio comes in at $39 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
- +Waterproof welded construction from a respected UK brand
- +External daisy chain adds lashing versatility
- +Handmade in Yorkshire with excellent build quality
- +Dual-strap mounting keeps the bag stable
Watch Out For
- −Roll-top requires stopping to access contents
- −Can rub seatpost over time without protective tape
- −International shipping adds cost outside the UK
The Bottom Line
We haven't scored the Restrap Saddle Bag, and neither has anyone else we can cite. It's here for its verified specifications and dimensions, which is what the fit tools run on — a score is an editorial judgement, and we don't hand one out until someone has a basis for it. What this page can tell you is measured: 535g, $208, and how both sit against every other seat bags product we track.
Price and Weight checked against the manufacturer on 18 August 2026 — see the source.
Specifications and dimensions come from the sources listed above. Where a page draws on first-hand riding, it says so.
How the Saddle Bag compares
Against the bags people cross-shop it with, measured rather than reviewed — including how many real frames each one fits.
How it compares
Against the 18 seat bags we hold published specs for.
At 535g the Saddle Bag is lighter than 6 of 17 alternatives we track. The category median is 466g.
At $208 it undercuts 6 of 17 of them, against a median of $170. That works out at $39 per 100g — above the $36 median for seat bags.
Weight and price come from published specifications. Cost per 100g is a blunt measure — it rewards light gear and says nothing about durability or whether the thing works — so treat it as one input, not a verdict.
More in Seat Bags
Seat bags extend behind the saddle, carrying gear without the need for a rear rack.