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: Can I fit a 15.4 inch (pretty standard size) laptop into the side compartments? Could you please measure the hight and width of the side bags?
Document: I've had this bag for about a year, and its exactly what I was looking for. As a bike-commuting grad student, I needed everything to fit and be protected. I could easily fit my 16 inch laptop, several books/notebooks, water bottle, coffee mug, and a lunch in all the compartments. I never sustained any water damage to my possessions when biking in the rain, which is great. Its incredibly sturdy, and hadn't yet shown any signs of wear.
It has a slotted bottom plastic piece that's designed to work with their rack, will still work with other racks, but might involve a zip tie or three. Aside from mounting, I do really like the bags. 15&#34; laptop? No problem for the laptop itself, the laptop bag probably won't fit in here. Laptop on one side, change of clothes in the other, lunch up top and you've got yourself a commuter bike.
But it is still plenty big. I have been using this bag for 50 mile commutes on weekends and I've been able to fit all of my personal items and upwards of 5 changes of clothes in the bag.I only wish the panniers were a little bigger so I could fit my 17 inch laptop. Well, it fits just I am not able to zip the bag completely shut.
I bought this bag for bike so I could get my school work to and from campus. The side pouches that fold down are great and hold my large bulky laptop. I also carry my charger, mouse, iPad, notebooks, change of shirt and bike lock. Everything fits and there is still room just in case I need to bring anything else to school. The quality of the bag seems to be pretty good and the zippers are good. Overall great bag!
One eventually tore off completely and so was left without a carrying handle. So why 4/5 stars if it broke so quickly? Topeak customer services/warranty is why. I provided the original receipt, description of the defect, and shipped it off to them (I had to pay for shipping). I gave it a week, followed up and got a response back that my bag was on back order but could give me the next size up for free.
Look. The bag itself is high quality, strong, and well made. The expandable sides are cool and fit my 15&#34; laptop in a protective sleeve perfectly.However, the whole MTX mounting system is a royal pain. You have to have a proprietary MTX Topeak rack to mount this properly. Even once you do, the latch isn't very secure and is made of plastic.
Great sturdy standard bag...plenty of room and has the typical velcroed partition to resize compartments. Love the Topeak MTX rack-lock feature that allows you to quickly remove/install the bag or move from bike to bike (when both have an MTX rack); much more secure and convenient than velcro fasteners. But the fun happens when you flip down either panel to open the pannier bags.
Ok, I got the MTX rack for Xmas and then I took a while to pick my bag. I was looking for one I could fit my laptop in since I bike to work. My laptop does fit in the pannier when it's extended, but just barely. I can't fit it in thee with the case, probably not the safest way to transport my PC.
With the Panniers I like to use for my commutes to work and carry extra shoes on one side, and in the other side, dress pants and shirt and I still can squeeze in a portfolio. Have not tried a laptop, I think it would be possible for a 15", and would want to use an extra padded laptop carrier bag.The material is durability enough to handle most travel conditions. It is water resistant which works for most conditions. It is not water proof.
It is really clever and quick how it folds up into the side panels and zips away when you don't need them. I have a 15&#34; macbook pro in a slim shoulder bag which I can just fit into one pannier (I would not put anything delicate in these panniers unprotected, there is zero padding, just thin nylon). Packed lunch and some other odds and ends go into the main compartment.
Answer: yes