Overview

Side cases (AKA panniers, a term that was used with donkeys, mules & horses) provide extra storage space.
They are located to the side of the motorcycle and mounted on specially designed luggage mounting racks.
Side cases have a lower center of gravity and are more streamlined with the motorcycle, compared to a top case, but add width which can make the V-Strom harder to handle through narrows passages/traffic and can reduce ground clearance when cornering.
By and large, side cases are much more costlier to install than a top case, because they require a costly mounting rack and there are also 2 side cases instead of one.

Suzuki OEM

Shown with the Suzuki OEM top case:
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After Market

Givi E21

Shown with Givi V46 top case.
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Givi E36

Shown with Givi E45 top case.
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Pelican 1550

Shown with SW-Motech Quick-Lock side carrier
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Caribou 36L (iM2600)

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Hepco Becker Gobi

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Happy Trail

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Comparison between different models

https://sites.google.com/a/happy-trail.com/happy-trails-products-wiki/project-definition

Installation

http://www.stromtrooper.com/general-v-strom-discussion/23551-happy-trail-rack-cans-install-08-dl650.html


Micatech V2

http://shop.micatech.net/Suzuki-650-VStrom_c16.htm
Shown with 8in Black V2:
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SW-Motech Trax

Shown with Givi E460 top case:
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Touratech Zega Pro

http://www.touratech-usa.com/Store/1794/PN-052-370X/Zega-Pro-Pannier-System-31-38L-Suzuki-V-Strom-DL650

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References

1. http://adv.strom.free.fr/bagajri_e.html