The new first spear pack is pretty cool. It will attach and quick detach too. Also Eagle makes the YOTE and the MAP. (the MAP is more of a Hydration carrier with space.)
The PIG line is always expanding too but nothing coming out to fit your needs in the near future.
First Spear ECP

SOS

Please don't bombard me with a million questions, but the PIG modular assault pack/ hydro carrier will debut in about 6-8 weeks. I'll have some pics up on our industry page when I get my hands on the final version.

SOS

Yeah.... I know. We have a lot of irons in the fire with the PIG line as we continue to expand it. Trust me, right before a release of a new product I get pretty antsy, probably more so than our PIG fans.

SOS

In the words of magpul in 2007"we're coming out with this rifle called the Masada, but don't keep bothering us about it". ;)

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Ouch! While I'm a huge fan of Magpul, and I'm sure there are factors, way out of their control, for the delayed release of the Masada but if any of our designs take that long I will boil the first one made and eat it on youtube for everyone to see. Bet no other company has offered to physically eat a product if it can't be released in a timely manner - BTW SKD probably won't sign off on me eating a PIG assault pack but I'll do it on my own dime if that day comes.

As far as Kifaru's E&E pack, you guys will love it. I own three packs from Kifaru and love each one. They have a few deployments in them and other than my krylon camo jobs on them still look and work perfectly.

SOS

I was just pointing out that saying something is coming out around here is like leaving a trash can out with no lid in the mountains, the bears are coming






 

I have never been a big fan of assault-packs, or similar-sized objects, that attach directly to vests/plate carriers/etc., for a variety of reasons.

Generally speaking, they are not so easy to attach while wearing the carrier.  Most are easy enough to detach, but without a buddy handy, re-attaching them is problematic unless the carrier is doffed to do so.  Sometimes that might not be practical.  If you are on the run, it is a lot easier and quicker to don a shoulder-strapped assault pack than to re-attach one to your carrier.
Secondly, if the carried object lacks shoulder straps, that obviously lessens its' versatility.  You cannot wear it unless you wear the carrier with matching QD buckles.  If optional shoulder straps can be attached, then you have the added complexity of QD buckles for the shoulder straps, and possibly added expense, as opposed to an object with simpler, dedicated shoulder straps.
Speaking of QD buckles, wearing a heavily-loaded 3-day pack might be getting close to the weight limits on some, standard QD buckles.  It's been done, but note that fastex makes a QD buckle (not easily found) that is intended for greater weights than the usual QD buckle.  "SnapDragons", IIRC.  I have some, and they are FAR stronger than standard QD buckles, for a very slight weight increase––a few grams, I suppose.

Frankly, and IMHO, It seems to me to be less of a bother and more versatile to use an assault pack with decent, fairly thin shoulder straps.  I understand that as-configured, some rigs make shoulder straps problematic; in that instance, I would suggest re-thinking the rig's layout so that shoulder straps are not a precluded option.

In the event that shoulder straps are not at all an option, the wise person would make sure to have a couple of male and female field-expedient replacement QD buckles always on hand.  Stashing then in the bottom of the detachable object might be a good idea.

If you do buy a pack or other object that attaches directly to your carrier, I urge you to pick up an inexpensive pair of surplus ALICE shoulder straps.  The LC-1 version (most common) stinks when wearing a full ALICE pack, but they have plenty of padding for most smaller objects.  Lots of other vendors/mfrs offer similar, often on sale.  These shoulder straps can easily be configured with QD buckles to attach to your object, and experimenting with this inexpensive alternative might be worthwhile.  Make sure to add a sternum strap; some webbing, a QD buckle, and a couple of tri-glides is all that is required to do so, and it makes a world of difference.  Mandatory, really.  

YMMV.

I have a Kifaru E &E and a Tactical Tailor whatever theirs is called. I've only used them on packs but they have some utility in being able to unclip the smaller pack and reattach it.

I know you have a self-admitted fetish for assault packs. Here's your go-to Spec-Ops, SEAL, UDT pack:http://www.unclesamsretailoutlet.com/US-Military-SOF-Water-resistant-Backpack-CBR-Bag-8465015005484.html.

I don't understand why a pack with shoulder straps worn over armor carrier would cut off circulation ot one's arms vs. the same-weight pacl attached directly to the armor carrier.

As a matter of simple physics, the shoulder straps of a pack, assuming they are the same width as the shoulder tops of the armor carrier, and when riding on top of the armor carrier, should have their weight/pressure distributed by the shoulder portions of the armor carrier.

The net weight on the user's shoulders ought to be identical in both instances.

If the pack's shoulder straps should slide off the armor carrier, then I can see a problem developing.  OTOH, sternum straps, adjusted properly should avoid such a problem.

Maybe I am missing something, and perhaps you can educate me.

Interesting, yeah the TT kind of dangles down from the upper attachments. I've only used them attached to larger packs.  My TT had the interior material between the two sections rip and that was through really very little use and there was nothing particularly hard or sharp in there.  The TT does seem bigger than the Kifaru but the Kifaru rides great for a small little bag

 

I'm not trying to dog you, but trying to understand.  I've worn my 3-day pack, over Interceptor armor plarform, for a day's worth of hiking with minor discomfort.  I think the use of the sternum strap essential in maintaining user comfort, and failure to use it is asking for  big trouble.

For that matter, I've worn MOLLE GI  and CFP-90 heavy packs over same platform, and have not encountered arm numbness.  Again, use of a tight sternum strap seems to make a big difference.  Your thoughts?

Well, a proper waistbelt takes mebbe 60% or so of the weight of the backpack, but I don;t think that is something that most 3-day packs, and certainly all direct-attach packs have as a feature, so the waistbelt as a load-carrier point is moot, I reckon.

Most 3-day packs have a belly band, which takes no weight, but simply keeps the pack from flopping around.  Vastly different critter.