The extra area inside is limited. I have a couple of other small cords along with the power cord, but the space is not big enough for a 50' XLR or similar. Maybe you could lay extra cords on the HELIX LT and close the lid on top of everything.
The flight case, including shipping and tax, was $198.12. I know there are cases for less money, but I had a fly-gig to pack for and didn't want to have to customize the case (inside padding) in any way.
For sure, it was a hassle-free experience and the case is excellent. I may also pick up a gig bag/back pack for local gigs, but really don't believe I need it. Thinking about it, I carry my guitars in hard shell cases for a reason.