Most helpful critical review
120 of 129 people found the following review helpful
nice large capacity bag, that attaches to the seat post with a damn RUBBER STRAP!!!
on August 5, 2010
Made primarily of Denier Cordura, a heavy duty nylon, the Avenir Bigmouth is a fairly well built underseat bag, with over 100 cubic inches of capacity. For protection and easy cleaning, the bottom and lower half of the sides of the bag, are coated with a layer of plastic sheeting, which repels water, and helps to keep the contents from getting wet. Applying a little silicone spray, helps to loosen up the zippers.
The bag has an adjustable strap that is used to secure it to the underside of the seat. The strap has lots of slack. The construction of bike seats varies, as some have springs below the seat, but there should be a way to make this system work. The rails and springs under the seat, will affect the angle that the bag hangs at, and this in turn affects how the bag is secured to the seat post.
From the product description and photo, at one time this bag utilized a nylon strap and Velcro to secure the bag to the seat post. This unfortunately is no longer the case. There is now a curved plastic fitting that is supposed to clamp around the post, a rubber strap is then supposed to wrap around the post, and hook back onto the fitting. This design is a freaking disaster! In order for this system to work, the fitting must have good solid contact with the seat post, and unfortunately, this can be achieved only at a limited range of angles. If you are out of this range, the rubber strap will be stretched beyond its limits and will be too short to reach. Pulling excessively on the rubber strap, can pull it out from the fitting. If you have problems with attaching using the rubber strap, try securing the fitting to the seat post using tie wraps. Even if the rubber strap does work, it is hard to imagine that this system would hold up well long term, with a fully loaded bag, and under heavy riding conditions.
Depending on the bike, finding space under the seat could be an issue, and the bag may obstruct your rear reflector. As the bag may need to be jockeyed around to fit, making the ridiculously designed seat post clip work, is even more problematic. If there was some kind of hinge, the fitting might be more usable, but as designed it lacks the flexibility to be reliably installed on every bicycle. There are no dividers inside the compartment, just a small netted pocket on the back side of the flip down back cover. The compartment of the Bigmouth is expands by unzipping the zipper running along the bottom edge of the bag.
This is well made bag, that is very reasonably priced compared to the competition, but it earns a one star deduct for the poorly designed seat post clip. Avenir is a very experienced company that should know better than to replace a proven design, with one that is an abject failure.