LOOYUAN Black Waterproof Cycling Bicycle Bike Rear Seat trunk Bag Handbag Pannier

I was very disappointed with the "magic tape". The Magic tape is poor quality Velcro that will have the bag drop off while riding if you have any thing in the bag. I had to just tie a not and fasten with zip ties to secure. Since I don't plan on removing the bag, it worked out. The only other option would be some type of additional to strap to make secure. Inexpensive bag that is Ok, if you understand not to trust the "magic tape".

A decent enough bag but it is kind of shapeless. Unless you want to use the side pockets as panniers, they are not really usable. Most of the trunk bags I've seen or owned have a little more foam in them to help hold the shape. If you plan on taking it off the bike frequently, the handles would be nice, but if you plan on leaving it on the bike they are a nuisance. This is ok for casual use but you might want to spend a little more and get something not as poorly made.