I just got a new Reunion Blues Continental gig bag for bass. This thing fits all of my basses! Even my wide cocobolo 7 fretless. I'm amazed. I picked up a guitar one for my status 5 and it was perfect.  Now if the bass bag fits the 10er I'll be over the moon but thats 2 days away to find out. Oh, got it through Amazon, no tax or shipping.  Just passing it on.

What are the interior dimensions?

Is this it, Danno?
If so, you can find the dimensions on the link, Mica!
 
Greg

Thats the one.
Weights & Measures:  
External: 49.5 Length x 15 Upper Bout x 16.5 Lower Bout x 7.25 Depth  
 
Internal: 48.5 Length x 13 Upper Bout x 15 Lower Bout x 3 Depth
 
Not sure about a Series but my Europa 5 fit. All my medium 6's fit, all the Excels too.

If i could find one to fit my Dragon Wing It would be Heaven!

Try a Body Glove hybrid bass bag. It's internal dimensions are 50 x 16-1/4 x3
It was large enough to hold my 1976 series 1, long scale and point body. I have shipped a couple of basses overseas in this case and there has never been a problem.I think they are being discontinued so get one while you can. Around $110.

Another endorsement of the Body Glove.  I use their bass hard-sided bag for my 1977 Series I 12 string with the LONG knobby peghead.  A great hybrid bag.
 
Bill, tgo

I got Body Glove hybrid for my series 1 5 strings basses.
But it is not enough for these. (a little short of 50)
I am still looking for the best one.
 
Eiji

I saw one of these Continentals at a local store, plan to get one soon.  VERY nice, one of the few bags I would trust for an Alembic.  I've always been very fond of Reunion Blues, not cheap, but high quality by people that do their homework.  
 
J o e y

OK Danno, I just ordered one.  
-Jon

looked but cant find the body glove anywhere!

There is a dealer on e-bay selling the Body Glove bass bag for $68.99. There are 7 left.
 
http://cgi.ebay.com/Body-Glove-Electric-Bass-Guitar-Moisture-Wicking-Case-/360310465604?pt=Guitar_Accessories&hash=item53e42d6444

Eiji - I use it for a Series 1 and it fits great. My Series 1 has a regular crown headstock and point body. Does your 5 string have a 35 inch scale or larger headstock?

Hi Mike,
 
My 77' 5 strings is 34 inch standard with omega, but larger Fan head.
There is no room arround the top, and the bag is slightly stretched with zip it.
 
By the way, do you think about neck support ?
Body Glove has no support.
I am afraid neck-head tension.
 
Eiji

EiJi- You are right, there is no neck support. I cut a couple of supports out of styrofoam and wrapped it in black velvet.
Mike