Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: I have the avenir rack top bag. Will my rack top attach on top of these panniers?
Document: My laptop in it's padded envelope fits in one of the side bags, the fabric is strong, the zippers work well, and the straps to attach it to the bike rack work well. See my review of the Avenir Metro III Panniers (2,165 Cubic Inches Total) to see why I switched to this one. Incidentally, I have a 20 year old bag constructed just like this one but with less bomber fabric - and it is still in decent shape.
Great capacity, but I am not satisfied with how it attaches to the rack. It moves around to much when loaded. The four open face buckles that attach the panniers to the top of the rack can't be tightened down enough to achieve a secure fit with the rack I have. The shifting of the bags then loosens the buckles.
They also include a handy little clip on each side that you can adjust to one of three optional heights and attach the pannier to the bottom of your Bicycle Carrier Rack. Convenient!The panniers are held to the Bicycle Carrier Rack up top with four canvas straps and four plastic loops.
Avenir Metro Panniers (1,380 Cubic-Inch Capacity)I'm not sure yet how to attach pictures to this, but I was really impressed with the size and quality of the product in comparison to the pictures I've seen online. The pictures, of course, show the bags stuffed with paper in order to reflect the full capacity; though, when the panniers arrive, they come flat.
I reasoned my way into these instead of the Metro 3.0 panniers by saying this: those other bags have a top compartment that supposedly gets squished when you load up the bottom. If I decide I want more space later, I'll just get a rack trunk, which can easily be loaded on top of this bag. Plus, this one comes with a carrying handle, which is nice.
I bought these panniers to replace the backpack I'd been using on my commute to work since I didn't think a trunk/rack top back would be large enough to hold my lunch and a change of clothes. Their construction seems solid, and the price is certainly good. They easily held what I wanted to carry.I've returned the bags however because my heels hit them while pedaling. This is in no way a fault of the bag, but something to be aware of.
You worked really well when I worked in a lab where I could bring my bike inside the office, but once I had to start locking my bike outside, I found it tedious to attach and reattach the four straps to the top of the rack every morning and night. Sometimes I regretted that these straps prevented me from using the top of my rack to transport other objects.
My heel hits the panniers on every pedal stroke. These are designed poorly. They are mounted to an Avenir XL rear rack so they should have been compatible. They are on an medium frame Pugsley (29er) so it's not like they are crammed on some tiny BMX bike. I would not recommend these and I will probably return them.
For the longest time I couldn't find a set of panniers that were at a reasonable price. All the big brand names were charging ridiculous prices for just one. Finding these Avenir panniers was one of my best finds on Amazon. No regrets.Purchased June 2011.They're sufficiently sturdy, water resistant, and don't take long to put on/off the rack once you know what you're doing. You can tell front from back by the reflective bands.
Installed these on my TREK 7100, they can carry a lot of stuff. I do have to watch the bottom front edges and my heels, as they can hit on occassion, but it has not caused any issues. I only use the panniers to head down a few miles to the local market - so I can't comment on their use for hard core treking, but recommend them for round the town use, and confirm they fit exactly on the Avenir Universal XL Rear Rack.
Answer: yes