Not if that's what you need to carry your supplies. The little thing pictured isn't necessarily a BOB, it's one of many different bags that I have for specific reasons and uses. This one is a truck bag that always stays in my truck. It's an Austrian army butt pack, so it's really not all that large at all. In the role it serves, I feel it's fine.
I've got another one that I carry in and out, which I view as a get home bag. It has a slightly different set of items in in, with overlap in the 5C's. It's a Maxpedition Gryfalcon, and it larger, due to it's different purpose.
Then there's my proper BOB, or in my case, it's more of an INCH bag. That's a Marine Corps ILBE. It is, in a word, huge. Probably too huge, honestly. Thinking about carrying that for any distance is not a joyful thought.
It all comes down to what you determine the purpose is. My truck bag is something along the lines of a 72 hour bag, something to give me some comfort and very basic needs items for a short time. The get home bag is larger, and set up a bit more toward a longer time frame. The INCH bag is basically a kitchen sink on my back. Some may think that's it's silly, and they may be right. Time will tell.