I bought two of these for my wife & I's Dahons. Mine's a Curve D3, hers is a Speed D7.
Today, I used the bag for the first time. Allow me to give you a blow-by-blow.
The plan was to take it on the train to the station near work, ride to work, then ride to the hospital afterwards. (for physical therapy for my messed up thumb from the scooter crash in late May)
7 AM - The bike is in the bag. I pick up the bag by the shoulder strap and carry it to the car. Some of the stitches pulled out near where the top of the strap is sewn to the bag. Upsetting, but not the end of the world; there are a LOT of stitches, after all, right? Right.
8:45 AM - I get off the train at the station that is 3/4 mile away from work. While stepping down the steps to get off the train, the stitching that holds the strap that is sewn to the bag and is sewn in a loop to hold the plastic D-ring gives way. *POP* and I just barely keep the bike from falling onto the concrete from about 4 ft. up. I'm left holding the whole bag by one end of the strap, with my arm way up like a total idiot. "Damn!" says I. I got off the train, pulled out my trusty Gerber knife and cut the loop that was holding the other end of the shoulder strap on. Threw the shoulder strap in the garbage. Packed the bag inside itself, (nice feature, BTW) and strapped it to the luggage rack of my D3. Rode to work. When I got to work, I put the bag into my backpack. Carried the bike into work without its bag.
3:00 PM - I'm getting out of work, ready for a sweaty ride to the hospital. It has been raining in Chicago for the better part of 3 weeks now. The sun has decided to come out in full force. The moisture in the ground is all evaporating into the air, and now it is 85°F and about 99% humidity. I left the bag in my backpack. Rode to the hospital. Great ride, once I accepted that I was going to get soaked, either from sweat or rain.
3:45 PM - I got to the hospital. Folded the bike, packed it into the bag. Went in, did my business, and came out.
4:15 PM - Packed the bag inside itself again. This time, another seam of the bag ripped open. One of the seams that holds it together, actually. "Grrrr!" said Jeremy. I resisted the urge to throw in the nearby trash can. I can't figure out why I bothered to bring it home now. Now it is just going to take up space in MY trash can.
Nice design, how it stows inside itself. Great zippers. Decent nylon material.
No hand straps. The backpack straps are a joke. Carrying a folding bike like a backpack is a bad idea, as there is always something poking one's spine or kidneys. However, these are the only straps left, after the shoulder strap gives way. Crap sewing job, all the way around.
Knowing that this bag would be used for a 20+ lb, one would think they could be bothered to do a decent job on the seams and reinforcement areas.
I did have some clue going into this. The disclaimer on Downtube's website says that the bag is not covered by the warranty. I decided to take the chance & got burned. Twice. These bags couldn't have cost more than $5 to make, and $10 for Downtube to buy. The quality is just awful.
I was generous and gave it a 2 because the zippers are good and the basic design is OK. Execution is the worst I've seen. If I were Chinese, I would be ashamed of what my country is doing to my stereotype.
I think Yan is not including the bags with the bikes any more. Probably because he knows what I now know. Doesn't want to jack up the price of his bikes by including a quality bag.
I haven't contacted Yan, as I think I'll get the cold shoulder, and a quick point-out to the wording on his website. I'm sure he'll read this though. We'll see.
Buy cheap, buy twice. Buy once, cry once.
Don't let the fact that the bag is included with the 2007 closeout bikes bias your purchasing decision. The bag is 100% worthless.