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ATA 300 Category I Flight-rated construction
Made in LA Los Angeles, CA
Built for the kit Accessories, AKS, transport state
Rental-house fleet Standardized, re-orderable, engraved
Trusted 100+ Years Protecting gear for generations

Master Built Primes (6 Vertical) ATA Case

Model 3721-6

Innerspace Cases

$999.99
Built to Order
Fabricated ATA
Construction
Fabricated ATA
Interior
CNC-cut foam, programmed for this build
Build time
14–21 business days
Protection & manufacturing details
Protection
ATA 300 Category I
Made
North Hollywood, California, USA

Shipping: Shipping is calculated in your cart for your destination and configured case.

Production time and carrier transit are separate. Review shipping & returns before ordering.

Standard Build Black case · black lid stripe · nickel hardware · black foam

Start with the standard finish, then review the functional options below. Custom finishes remain available.

Case Color (Required)

Customize colors & hardware

Review functional options below; finish choices can be expanded as needed.

Lid Stripe Required
Lid Stripe (Required)
Body
Lid stripe matches body
Hardware Color Required
Hardware Color (Required)
Latches Required
Foam Color Required

Black top and bottom is standard. Any other combination adds $35.

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The Masterbuilt Compact primes are the compact-housing variant of the Masterbuilt cine line — smaller barrel diameter than the full Masterbuilt set while keeping the same optical formulas and character. The Compact line is the right choice when weight and cart space matter more than absolute matched bokeh size. This case carries a 6-lens Compact set covering 18, 25, 35, 50, 85, and 105mm.The CNC-cut foam interior profiles each Compact prime to the standardized Masterbuilt Compact barrel — consistent across the set. The 6-lens layout uses vertical loading to keep the case footprint compact. Each lens loads with PL mount facing up for fast deployment.Shell is ATA 300 Category 1 with recessed ball-corner latches, pressure-equalization valve, and reinforced soft-grip handles. Closed-cell polyethylene foam CNC-cut to the Compact barrel.Built in our North Hollywood workshop. Lead time 14–21 business days. For variants with additional Compact focal lengths or matched cases for the standard Masterbuilt line, call 818-767-3030.

Specifications
SKU:
3721-6
UPC:
042782000861
Weight:
23.00 LBS
Shipping:
Calculated at Checkout
Case Construction:
Fabricated ATA
Protection Rating:
ATA 300 Category I
Exterior Dimensions:
19.5 × 14.25 × 12 in
Foam Status:
CNC Programmed
Made In:
North Hollywood, California, USA
Lead Time:
14–21 business days
Gear:
Cinema Lens

Will this fit my setup?

Tell us what you’re protecting and everything that travels with it. We check it against this build’s foam layout and reply with either a confirmation or the change we’d make. No obligation, and it goes to the people who cut the foam.

We reply with a real answer, usually same business day.

My setup is different

Different body, extra accessories, an accessory that has to stay mounted, or dimensions that don’t exist yet. We modify an existing design or engineer a new one.

I need several

Repeatable foam layouts, consistent hardware, replacement foam and reorders against the same drawing. Standard practice for rental houses and studio fleets.