Ultra-tight, ultra-snug, and ultra-secure, the BOA Seat Pack has easily made it to the top of our list for keeping our essentials on the bike. We're especially impressed with the BOA dial security, as the dial tightens an abrasion-resistant strap on our seatpost preventing sway or movement while we're riding. We use this bag for long days in the saddle when we're not sure when we'll get home or how rough the weather is going to be.