SKB 3R-4436-24 STAC Stackable rSeries Waterproof Case

Two different manufacturing processes for two different jobs. Injection molding (the iSeries) uses a rigid steel mold to produce a smooth, precise shell that is fast, repeatable, and cost-effective for standard sizes, but the mold itself runs over $100K to modify, so the size catalog is fixed and caps out around 55 inches in length. Roto-molding (the rSeries) uses more flexible tooling, which means SKB can build non-standard sizes, custom depths, and even cut-and-weld multiple shells together into ultra-long enclosures. If your gear fits an iSeries standard size, that is typically the lower-cost route. If you need extra depth, a custom length, or a build beyond 55 inches, the rSeries is the answer.

Yes. Every rSeries case is IP67 rated and built to MIL-STD 810. The roto-molded LLDPE shell is dust tight and water resistant, and includes an automatic ambient pressure equalization valve (MIL-STD-648C) for sealed altitude and temperature transit.

Yes. The rSeries is engineered for repeatable fleet logistics: squared corner blocks, planar lid and base, and reinforced wall geometry stack cleanly on standard 48" × 40" pallets. Optional STAC stackable hardware and forklift riser kits are available on most models.

The rSeries naming convention encodes interior dimensions. For 3R1209-26, the first set (12) is interior length in inches, the next (09) is interior width, and the third (26) is total interior depth (lid + base). The trailing "B" is the SKB color code for black.

Yes. Because the rSeries is roto-molded, the tooling is flexible. Adding 2 inches of depth or extending a length usually does not require the hundreds of thousands of dollars in new tooling that custom injection molds demand. For truly oversized payloads, SKB cuts and welds multiple roto-molded shells together into a single custom case. One example: an 8-foot enclosure built for a U.S. Navy program supporting long-format high-value sensitive equipment intended for long-term deployment. If your program has the volume to justify it, custom sizing is on the table.

We design fully custom interiors for every rSeries case, including pick-n-pluck cubed foam, precision-cut layered convoluted foam, and Nylex-wrapped fitted foam with hook-and-loop accessory mounts. Engineering provides CAD review and prototype validation before production.

Yes. SKB-branded hardshell cases carry an unconditional lifetime warranty to the original owner against defects in materials and craftsmanship. If the case body fails in normal use, SKB replaces it.