I need a pair of panniers for a summer trip. I am planning on doing some off-road touring. Not for very long--out two to three nights--but I'll be covering variousterrain. Will start on paved roads, ride into the country until I'm on service and ranch roads (dirt and gravel), then go cross-country on high steppe terrain with sage brush and some rough basalt rock. I expect I'll be walking a bit on those sections.

So I need a pair of panniers for my gear and these from Nashbar seem like they might do the trick. I'll be putting these on a Gary Fisher Tassajara MTB that already has a Topeak rack on it. Could also try posting this in commuting, though they aren't really going to be for commuting, but thought I'd try here first.

https://www.nashbar.com/bikes//Produc...2_165648_-1___

They should be fine. I have a pair of Nashbar's "Waterproof Panniers" and don't have any complaints - I think these are pretty similar in mounting hardware and quality.
Does your Topeak rack have the third leg extend back a bit so keep the rear part of panniers from rotating into the spokes? That was the only issue I encountered with my pair of Nashbar panniers when used on the rack I now have on our tandem. No such problem with the rack on my single touring bike.

They are good.
56 lb load. Have my Coleman tent in one of the front ones.

Leaving in the morning for 11 days riding with 10 nights camping 600 miles.

Sorry can't answer your specific question... But my all time favorite panniers are from Carradice
It could probably give you some extra ideas.

The super C series: https://www.carradice.co.uk/categories/superc

I have those exact panniers, I use them on my MTB which is my commuter. All I need to carry back and forth are a few files, my computer and my lunch + big water bottle. I only use one of the two - that's all the volume I need. They are well made, they stay on the bike well and my foot does not hit them. My only concern would be volume, is there enough for your needs.

Thanks for all of your answers. And 10 Wheels, have fun on that tour. Wow!

The Topeak rack has three support struts on each side--one vertical and the other two coming in at an angle, front and rear, all converging to an anchor point near the rear axle (I have the rack that goes with disc brakes).

The Nashbar bags have 2350 cubic inches, in addition to a bag that will rest in the middle atop them. Since I'm only planning two- to three-night trips, and am concentrating on going light, I think that ought to work.

The Carradices looked good, too, but I find canvas to be heavy and I reckon they'd cost quite a bit more than the Nashbar bags.

Thanks again for your replies. I'm putting in an order for the panniers today!