LBT is certainly top quality, and few will argue otherwise.  OTOH, their standard prices are WAY over what most folks will pay out of their own pocket, since there are other good alternatives.

Some observations:

The modular insulated pouch is interesting, but only if the bladder that is meant to go with it is available at a reasonable price.  Or if it fits some bottle you already have.

The low profile chest vest/modular vest rig does not use 1" QD connectors at the top front. attachment points  Most mfrs are gravitating to 1" male top QR connectors because there are aftermarket 1" female connectors currently available that will allow the user to clip-on the chest rig to their PCs, if desired, while maintaining stand-alone capability.  Such 1"onnectors interface well with PALS webbing, as opposed to larger sizes.  No pix of the rear of the rig, so no info on whether or not mods must be done there, either.  I'd pass, unless you want a simple stand-alone rig, and are happy with just that.

The Multi-Purpose Pack seems to lack any sort of PALS webbing on its' exterior, and so it is what it is: a non-expandable small pack.   I wouldn't draw any conclusions about the picture of the included bladder concerning what bladder is included.

The LBT 6094 PC is well-regarded, and this is a very good price.  The S&S skeleton retention rig for magazines is unknown to me, except for pictures.  The LBT 6094 kangaroo pouch is pretty capacious as these things go, allowing 6 X 30-rd AR mags, or 3 X 20-rd 7.62 mags with the appropriate internal pouch(es).  Personally, I bought s zipper for the kangaroo pouch so as to use it as an admin pouch, and I prefer to use clip-on mag-carrying rigs to the front of the PC.  YMMV.  The  6094PC has it all, and nothing else need be added, although the 6094RS has a release system. The side pockets will accept 8" tall by 6" wide hard armor, but I would go 6X6 to avoid the plate hitting the inner arm with every swing of the arms.

I returned a few modular sustainment pouches to LBT because I couldn't figure out an easy way to attach them to anything, and because they were cheaply made, unlike most LBT stuff.
   
I hate one size fits all caps, because they don't.

YOUR circumstances are your own.  Take my comments above as informed advice, but not Gospel.  As always, YMMV.