Modern bikepacking has a clear aesthetic: soft bags strapped directly to the frame, no rack, clean and rugged. Racks and panniers, by contrast, have been quietly recoded as old-fashioned touring gear, the choice of someone who has not read the right blogs. I want to question that, because I think the dogma is leading people to choose the look over the loadout that would actually make their trip more comfortable.
What each system is genuinely good at
Strap-on bags shine on rough, technical terrain: nothing to rattle loose, narrow profile, weight held close to the frame, no rack to fail. That is a real advantage on singletrack and rugged routes. Racks and panniers shine on capacity, ease of access, and packing comfort: you can carry more, get at it without unpacking everything, and load it in seconds. On smoother routes — gravel, road, easy trails — those advantages are large and the technical-terrain benefits of strap-on bags barely come into play.
The hybrid nobody admits to
You are allowed to mix them. A rack and panniers for the bulk, plus a handlebar roll and a frame bag for the rest, is a deeply practical setup that the purist framing quietly discourages because it does not look like the photos. Comfort and access are worth more on a multi-day trip than visual consistency, and the rider who mixes systems usually packs faster and lives easier in camp.
The point
Use strap-on bags because your terrain rewards them, not because a rack feels uncool. For a great many routes, a rack carries more, packs faster, and costs less — and the only thing it loses is the aesthetic. Decide honestly which one you are actually buying, and do not pay for the look in daily discomfort.