This is the Ortlieb Commuter Bag pannier in size Medium and color Pepper.
The Commuter Bag easily holds size A4 papers (8.5″ x 11″), a laptop (up to 15″), clothes, lunch, and other things. As a daily commuter it fits my work purposes. It looks nice too!
This bag is obviously marketed toward a bike commuter so using it in combination with other bags for touring is probably not an easy task as it must be angled for heel clearance and this makes use of the top portion of the bike rack less practical. The Commuter Bag is also probably also best suited for less heavy loads than conventional panniers because it mounts at an angle.
Why not just throw a backpack or messenger bag on my back? It is more comfortable to store luggage on a bike than yourself and having the weight lower to the ground helps improve handling.
However, even though the Ortlieb Commuter Bag has a laptop compartment I think it is still worth considering that the best place to store sensitive electronics is on your body to prevent vibrations unless your laptop has an SSD hard drive.
There are less expensive options, but I think this bag will hold up for the long haul. Generally I carry very few things with me on my commutes anyway, and go without any bag.
Things to consider when selecting a bike bag… carrying capacity (size, volume, load), price, looks, mounting system, waterproof or water resistance, weight, easy of use.
The Commuter Bag is waterproof to IP53. Read about waterproof-ness ratings here: https://en.wikipedia.org/wiki/IP_Code
Ortlieb Commuter Bag info: https://www.ortlieb.com/en/produkt-details/?produkt=commuterbag_urban&list=office-bags&slug=radtasche&clearname=Office%20Bags
Tip: Use electrical tape at the contact points where the hooks rest on the rack to eliminate any rattle noise and/or scratches.
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