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Input:
Question: Does it fit the Seagate Backup Plus 1 TB USB 3.0 Portable External Hard Drive STBU1000100?
Document: You get what you pay for. But what you want more to protect your hard drive?But won't fit the Seagate Backup Plus 1 TB USB 3.0 Portable External Hard Drive STBU1000100! !
I bought this for my Seagate Backup Plus 1 TB USB 3.0 Portable External Hard Drive STBU1000100. It only fits if I remover the adapter. The adapter still fits in the case though.
I must admit the fact that this is really good cover to protect a portable hard drive. Finishing is excellent and zip is fine but only thing is this is not for Seagate products. I bought two of this forSeagate Backup Plus 1 TB USB 3.0 Portable External Hard Drive STBU1000103 (Red)andSeagate FreeAgent GoFlex 1 TB USB 2.0 Portable External Hard Drive STAA1000100 (Black)but neither fit in to this case.
I bought this for my Seagate Backup Plus Slim 1TB Portable External Hard Drive with Mobile Device Backup USB 3.0 (Black) STDR1000100. The Drive fit perfect inside it. Would recommend to anyone who have this same External drive that this is the product to buy. The price is good. the product itself is very good.
This is a very reasonably priced and protective case for shorter hard drives. It is too short for the Seagate Backup Plus USB 3.0 drive I'd hoped would fit. I was able to squeeze an old WD Passport drive into it, but it was a tight fit. If the case was maybe 1/2&#34; longer, it would have been a more comfortable fit. So, make sure your device will fit first.
I purchased this for use with aSeagate Backup Plus Slim 1TB Portable External Hard Drive with Mobile Device Backup USB 3.0  (Black) STDR1000100and it fits beautifully. There is perhaps a 1/4-inch extra space on the sides, but considering this case was made for a WD drive, I am more than happy with the fit and the price. It is a hard molded case with a woven cloth exterior and an orange felt-like interior to prevent scratches to the drive.
Bought it for my WD My Passport 2TB Portable External USB 3.0 Hard Drive, it fits perfectly and the outer shell is solid. The sleeve inside fits the cable easily. A must buy for WD My Passport 2TB Portable External USB 3.0 Hard Drive but not suitable for Seagate 1TB Backup Plus.
I buy this case to protect my Seagate Expansion 1 TB USB 3.0 Portable External Hard Drive (STBX1000101)The case is a little small for the HDD, but it fits and the end. I can carry in the case the HDD, the cable and a USB memory.
Amazon suggested this case for the  Seagate Expansion 1 TB USB 3.0 Portable External Hard Drive (STBX1000101) . It fits too tightly. It works, but it is just too tight. Maybe it will stretch. It would be nice for a cell phone or a very small handgun.Twice this season, I've felt snookered by an Amazon recommendation.
I have 2 hdd in this case  WD My Passport Ultra 1TB Portable External Hard Drive USB 3.0 with Auto and...Toshiba MQ01ABD 1 TB 2.5' Internal Hard Drive  both fit fine w/ included cable. for Passport.
Answer: I would say no, the seagate is almost 5 inches long and the inside length of this case is about 4.5 inches.