Whether it's a race or training, rain or shine. It hardly sways at all, and the performance is amazing. Compared to other rush backpacks, the main compartment is against your back, so it's stable even with a lot of luggage. It's best to wear it snugly, tightening the waist. There's quite a bit of wear and tear, but nothing that interferes with use, so please consider this only if you don't mind the appearance too much. I think it's a masterpiece. Lightweight mesh RUSH backpack, adjustable with two pockets. - Model Name: RUSH UT2 - Color: Gray - Material: Mesh - Number of Pockets: As shown in the photos - Adjustment: With straps Thank you for looking.