I really liked these gear bags. They helped me stay organized during a frenetic trip to Africa. I put all external storage devices in one bag, all cables into another, and all lens caps in the third. In one case, the bag was bulging but the zipper was strong and I had no concerns about the sturdiness of the bags. I'd buy these again in a heartbeat.
These cases are fantastic, sturdy and versatile. TIP: they are a tad bit flexible so if you overstuff it (like I do) you can still zip it up. I'm a photographer and a DJ so I use them various things when traveling and on gigs. Hard drives in one, recording equipment in another, lenses, cables, chords, you name it. This is my 3rd set of these bad boys, so I have a total of 9! The only reason I give them 4 stars is because I am really hard to please and I never give a perfect score, and I just wish there was a bigger one because it's so damn easy to organize my stuff with these.