This Expandable Bike Seat Bag is very well made, however it has a horrible Design flaw.The back name strap is very loose, I can put 4 fingers in between the strap & bag. The result is when clipping on a "bike tail light" it falls over & points to the rear tire.
This is a Life & Death Flaw. The most important thing on any bike is the real tail light...it keeps you from death by car. If you want to Live, put on a bike tail light on your bike & don't Buy this Bag.
I had mailed a bike rack pack for repair to Lone Peak and received it back a few days ago. While I paid for the main set of zippers to be replaced, Lone Peak also replaced the expansion zipper set without extra charge.
In a brain-damaged moment several years back while cutting away some shopping bags from the top strap, I also cut the strap in two. Lone Peak replaced that too, something totally unexpected.
With Lone Peak's repair backlog, it took a while to get the pack back, but it was well worth the wait. Lone Peak went well above and beyond "the call of duty" for me. Highly recommended.