This Lone Peak Swayback trunk bag has 4 straps that use buckles and NOT Velcro. Yes! Finally, I figured out why the inner, top part of the right leg of every cycling tight I’ve ever used is in varying stages of “shredded”. So here is this trunk bag that fits my rear bike rack, comes in 5 different colors to choose from and is Velcro-free. The main section of this bag holds numerous jackets and don’t-leave-home-without-it stuff. The two side pockets hold all the other important, small items. This bag stays on the rack! Its most important, impressive feature is its eradication of Velcro.Much less room overall than I was hoping for. The main compartment is in a hard shell wedge shape which makes it fill up awkawardly fast. Think 'one rolled up Sunday newspaper' and then you're out of space in the middle. The side pockets expand some but aren't as long. Oh I forgot, one of the zipper pull covers fell off the first time I used it, so that's a minor fail there. I think I just threw it on the ground after it wouldnt go back on. I ended up giving the bag to my son for his bike, and he likes it just fine.Bag might work well in conjunction with existing Pannier bags, depending on your usage characteristics.I got this to carry a spare battery on an e-bike. It's the smallest bag that would still fit the battery - just what I was looking for and I have a number of extra pockets for other things. Nice low profile.Great pack, bought it for carrying my spare e-bike battery and the battery fits perfect. I like the clips instead of Velcro for securing it.