Best reliable small form factor
You really have to get more specific as in what components should go inside and how big or small you think a "small bag" is. The smaller you go the more expensive and boutique it gets.
Probably the smallest option would be the NFC S4 Mini at 4.2l volume, but you'll need an HDPLEX and an external power brick and you only have 40mm of clearing for a cooler (and you have to select your GPU carefully, 8" max I think).
Above that you have several options: Zaber Sentry (~7l) with support for full-length GPUs and SFX-L PSUs, DAN Cases A4-SFX (7.2l) with support for full-length GPUs and internal SFX PSUs, the often mentioned Fractal Design Node 202 (10.2l) at quite a reasonable price as it's not a small batch production (and people have put AiO and custom loops in it), NCASE M1 (12.6l) with support for 240mm radiators on the side, Silverstone's whole RVZ-line offers 4 options ranging all around 14l except for the RVZ02 (~12l), with the RVZ01 supporting custom loop cooling and the RVZ03 being pretty new and pretty nice looking as well, then there's the cube-shaped Cooler Master Elite 110A (~15.2l) with some GPU-length restrictions (or the Elite 130 at ~19,9l with full-length GPU support I think). And then there's the mATX project called Cerberus at only 18l which still is considered SFF (<20l). Not quite SFF anymore is the new Phanteks Enthoo Evolv Shift with a volume of 21,9l and support for 2x 120mm radiators (and tempered glass side panels).
Between 10l and 20l are countless more cases on the market from several big and small manufactures. You really have to be more specific on what has to go in it, how small it actually should be and the budget…
If your budget is tight then probably forget all the small batch production cases and aim for the Node 202 or Silverstones RVZ line-up.
EDIT:
Forgot about the following case:
Silverstone FT03-Mini (17.6l)
Lazer3D LZ7 (~7.1l) – not available yet
Louqe Ghost S1 (7.3l) – not available yet
EVGA Hadron Hydro (~18.2l)
Cooltek Coolcube (~10.1l) – pretty cheap and not best quality
Raijintek Metis & Metis Plus (~13.4l)
…

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