Getting a bicycle backpack is so much more economical than installing racks and luggage compartments onto your bicycle. Best of all, a bicycle backpack is convenient and it helps you carry your goods around even when you're not riding your bike. Of course, pick any random person off the street and they'll be hard pressed to differentiate a bicycle backpack from your regular backpack.
Bicycle Backpack vs. Generic Backpack
Bicycle Tool
The backpack is designed to look that much more stylish when you carry it on a bicycle ride. It's stitching and material used is also of greater quality as these bags need to endure arbitrary weather conditions. A generic backpack is also not designed to hold bulky items for long periods of time as well, so be sure to consider what objects you will be bringing with you on your bicycle ride. A few examples of typical biking items would include a pretty heavy water bottle and camping gear.
Other Options
If you need to carry large articles, you could opt for a pannier bag instead but that would also be that much more expensive as compared to getting a backpack. Whatever you do, it is highly inadvisable to invest in a messenger bag as not only do these bags need to be adjusted every few miles, there is also the very real danger of having the strap get caught, thereby causing the rider to take a tumble, or worse.
Getting Your Own Backpack
When it comes to selecting your very own bicycle backpack, the key is in selecting a model from a decent brand. Getting a bicycle backpack from a reputable company just ensures that your backpack will be able to last you for quite a while. Once you've found the brand that you like, you can then begin deliberating between colours and patterns before choosing your final bag. Do note that the straps of the backpack should sit snugly on your shoulder blades to prevent lower back ache during long rides.