Last year around this time I was at REI and they had this $89 rack trunk bag thing from Cannondale on sale for $20. It is made by Knog, which I am a fan of. It attaches to the rack with velco straps. and has some D-Rings on the back and a strap to attach blinky lights. Also it hs reflective material all over the trim on the bag.
It can fit the essentials. I can drop in a light jacket, wallet, cell, snack, a pair of Speeplay’s that I was returning…
The bag has two HUGE sidepockets that fold up in to the sides of the bags. These things are cavernous! They have a hook on the bottom to connect to your rack,
And the bag has a built in rain cover stashed in a front pocket.
Overall it is totally worth the $20 I paid. If you see one on sale get it.
On these hot muggy summer days when I might commute around to the store to run some errands this pack is nice. A courier bag can get hot and sweaty, and a big set of ortliebs is just too much, this is the perfect choice. Plus with those big side pockets you can cram a ton of stuff in if you need too.