REI Co-op  Junction Rack Trunk

This is a great bike rack bag for many reasons. It is easily attached and removed from the rack with 4 velcro straps. There is plenty of internal space and a variety of small and medium pockets for different sized items. The outer zippered pocket is handy for items that are commonly used on your ride. I packed a few drinks on my 2 hour ride and they were still cold when I arrived to my destination. While the description doesn't state it, the insulation on the bag does offer some type of temperature control. I was able to mount this on my old Trek bike rack without any issues. You can see on the picture that my seat is a little too low and the bag didn't fit as well under it, but nevertheless, was still able to slide under and be secured. I was also able to couple this bag with my Timbuk2 pannier bags and while it wasn't a perfect fit, it was secured just fine. I've used this bag a few times on my ride to the range and the gym. It was easy to take off the rack and stylish enough to carry around on these different activities. And the reflective material is a safety plus. I will be using this bag on my daily rides and will reach for it as an alternative to my panniers.

Outside: nice large zip pocket and reflective tape. Inside is 1 large zip pocket with a key clip inside, 1 mess end pocket and 4 nylon pockets. Totally functional bag. If I could change one thing I’d switch the quick-release buckles on one end so the bag could be clipped on the top and on the ends.

This bag is small but holds alot. You can fit a 6 pack of beverages and/or food. I even have put clothes and glasses and stuff while on a kayak trip. But it's best on the front or back of a bike. Keeps it all safe and cold.

This bag is an amazing catch‑all and so easy to attach and detach. One of the biggest issues I’ve had with bike bags is that they require special attachments and end up feeling very bike specific. What I love about this one is how versatile it is. It’s perfect on my bike, has tons of room, and worked great for a little beach picnic with my kid on our long-tail cargo bike. I’ve also been able to throw all my smaller snowboard accessories into it and head up to the mountain with zero hassle.

Very useful bike rear rack storage. It fits exactly on the rear rack. The size is perfect to store groceries or a couple of takeout boxes. It is easy to mount and dismount with velcro straps. The bag being waterproof is a bonus.

This is great for a day ride. Headed out on the tandem bike with my hubby, I can easily stash my essentials (wallet, keys, sanitizer, etc.), a jacket and a soft-sided lunch bag (either packing food or for leftovers if we eat out and I have some to bring home). A couple of the inside slip pockets are big enough to hold iPhone Pro series phones. The reflective webbing on the ends is sewn on such that you can clip lights onto it. It would better if the mesh pockets inside either had smaller holes or were solid fabric. With the key clip inside one, it kind of sticks with keys. I would also like to be able to purchase an accessory strap with male buckles to clip to the female buckles already on the ends of the bag so it can be slung over the shoulder to carry away from the bike hands-free. I get bags that come with shoulder straps that I don’t use, but I’d like the option for this one, even just put the details of what buckle and strap/webbing to buy in the description as optional accessories. Good quality and attention to details… like the ability to mount with either side towards the front and the two-way zipper so you and close either direction or anywhere along the zipper.

I purchased a REI Co-op Junction Rack Trunk and the velcro straps are not long enough to fit my Ortlieb Quick Rack. The straps cannot be closed after the plastic loop. Two straps on the same side can be attached, but not all four. In the YT demo video, by REI, which is on the product page, only one side is attached, with two straps, to the Ortlieb Quick Rack. You can see the opposite side is was not connected during the demonstration of the rear attachment point. see 0:26 time stamp in video. I based my purchase on the bag being shown with the same rack I have. If the Junction Rack Trunk is meant for racks with 6 inch wide platforms, the product description page must be updated. So, either this bag is likely incompatible with racks with approximately 4 inch wide top platforms (like the Ortlieb Quick Rack) or the strap length of my bag is considerably too short. The total length of the straps, when flat, when measured on the bottom surface is approximately 17 inches. I mocked up a longer strap length to see if it would work. I added 2 inches per side so the total strap length is 21 inches end to end. 22 inches would be better to fit a Ortlieb Quick Rack. I am returning this trunk bag. This is unfortunate, as it meets my needs otherwise.

“I received these products for free from the REI Trailblazers sampling program in exchange for my honest review.” This is a nice little bag for small books, pens, journals, paperwork, gym clothes and shoes, etc. A couple of internal wall pockets for organization. Fits nicely on my rear rack. The velcro hold-downs are strong but not industrial; for a quick on-and-off I find myself using only 2 of the 4 of them, as that is adequate for a city commute. Straps on both ends for a light. Probably water resistant, but the zipper is not. Will fit an iPad, but not a laptop. Holds plenty of take-out food. :)

Well designed & built, like you expect from REI. The gatemouth opening is easy to use with big items; straps/ buckles are well placed; internal pockets keep contents organized. Since it's not bike season now I'm using this as my commuter lunch tote. For this application it works great, with enough volume to handle my needs.

although its not for my road bike, i see the appeal of it. the securing straps feel very strong so i imagine it wouldn’t be a issue on the back of a bike that accepts it. the material is nice and tough as well, it holds its shape well so the contents inside will be fine. it has nice carry handles for being on the move