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: For holding the pack secure and from moving which is better buckle or strap?
Document: I like the buckle connection better than the new design. I guess the new design is a bit less prone to theft but any criminal in a rush would just empty the contents. It is not to much effort to take the entire pack with you. I like this product so much that I bought a second one for my other bike. I keep a spare tube, tire levels, 3 CO2's, a mini bike tool, and a inflator.
This pack is everything I was looking for. I prefer to buy my bike accessories from REI, but they only sold the clip-on version if this pack, which had really poor reviews for the clip breaking off. I went ahead and bought this buckle-version off Amazon, and it's performed perfectly. It's easy to get on and off the bike, holds a ton of stuff, and the buckles are really secure.
I bought this pack for my Trek 3900 mountain bike. It hss the best strap arrangement for this type of application I've seen, and it feels secure. It's the right size for my needs - it holds a spare inner tube, a small set of tire wedges, a multipurpose tool, a powerbar, a cell phone, and a debit card. Yes, I had to unzip the "expansion" zipper to make room for all this, but I was expecting to have to do that when I bought it.
This fits perfectly under my bike seat, the straps do a good job of holding the item secure so that it doesnt rattle around. Inside compartment is large enough for an extra tube, and tool kit, without expanding. I like the inside pocket. Would recommend.
Excellent construction. Without expanding, fits a small multi-tool and mtn bike size tube with just enough room for ID, phone, keys. If unzip middle-ish zipper, can expand cavity to fit a few more small items. I tried the 'small' size, and just wasn't enough to accommodate any more than the mtn bike tube, so returned it. The buckles work perfect, holding it nicely secure under the seat & to seat post.
I have a (beloved) traditional leather Brooks saddle on my Cannondale hardtail mountain bike, and I find that many modern saddle packs do not attach securely with the wide rail system that is used on the B-17 saddle. The Topeak Aero Wedge with buckle attachment system can adjust and secure successfully to this Brooks B-17 saddle, and it gives me just the right amount of room for my tube repair kit, a couple CO2 cartridges,  saddle cover, keys, etc.
Great size to fit under my seat on my road bike. I can fit my bike tool, a few gels, sunglasses, and my gloves in this thing. I wouldn't go any smaller or bigger. This is the goldilocks of wedges, in my opinion.Note that this is with a strap and buckle, not a fixer. The fixer gives it a cleaner look. I actually bought one of each thinking they were the same and they are not!
Good size bag for a road bike. I can fit 2 spare road bike tires, couple small tools, wallet, and have a little space left over. Good quality construction. I went for this over the one with the seat clip on top because of reviews on Amazon about the clip being prone to breaking. I've had no problems with the strap/buckle connection.
I was looking for a bag to hold two tubes, a multi-tool, patch kit, keys and cell phone. It was also important to me to have a secure strap mounting system. Straps may be overlooked as one might think plastic mounting bars and clips would be designed to adapt to any type of seat. This is not true as my previous bag dis not fit my new Sella SMP Extra saddle.
Good bike pack. Came as advertised and very simple design makes it easy to install and maintain. Great for holding wallet, keys, and small items.
Answer: yes