Please read about the mounting systems below, you will need to pick from 1 of the three when choosing this product.
Ortlieb has taken the best futures of their classic roll top panniers and combined them with all the things you would want in an office bag that mounts to your bike rack. The Ortlieb Office Bag Classic Large is waterproof and includes two partitioned inner liners. Utilizing Ortlieb's Classic material, this pannier stands out in classic white, black or silver.
QL2 System: This system is made up of 4 main components, an upper mounting rail which the top hooks attach to and a lower elliptical mounting rail where the lower anchor attaches. The upper and lower mounting locations can be adjusted horizontally without tools for easy bike or location switches. Top hook reduction inserts come with this system, they are 8mm and 11mm, the base hooks are 16mm. The upper mounting rail is equipped with a channel in the back which is intended to be used in conjunction with the security cables. For added stability an additional lower anchor can be added to the elliptical rail, this is especially effective in off road situations.
QL2.1 System: This system is similar to the QL2 in many ways but differs slightly in a few areas. The upper rail has been slightly changed, rather than having 3 independent parts the rail is 1 piece for additional strength. The reduction inserts no longer attach from the mouth of the top hook but rather from the side, and they are available in 8mm, 10mm 12mm and 16mm. The lower anchor doesn't have the elliptical rail but rather a slightly padded horizontal rail which does a nice job of protecting the finish on the vertical stays on the rack. This is limited to only the White and Black Logo Panniers.
QL3 System: This system features a new style of mounting component that removes the mounting hardware from the bag and attaches it to the rack. This component is fully adjustable both for heal clearance and angle of your bag. The bag with the QL3 system now has a more flush back so it's more comfortable to carry off the bike. The upper mounting clips have an auto lock so the bag stays securely mounted to the rack, simply pull the handle up to unlock the clips.
All Ortlieb products are backed by a 5-year warranty against defects in material and manufacturing.
Ortlieb Pannier Security Cables-Long
E166-Ortlieb Pannier Top Hook Inserts for QL1 and QL2 Systems
Ortlieb Pannier Carry System