A gun case cut to the silhouette of a firearm looks purposeful. A tube does not, and it outperforms the contoured shape on three measurable counts: enclosed volume per unit of fabric, how the body carries external load, and how quickly a firearm can be put into it.
Cylindrical body construction and cross-section comparison with a flat gun case
| Specification | Value |
| Model | SL-E302 |
| Cross-Section | Circular, 25 cm diameter |
| Cross-Sectional Area | 491 cm² |
| Body Length | 130 cm |
| Enclosed Volume | 63.8 L theoretical / 60 L usable |
| Net Weight | 1.35 kg ± 0.15 kg |
| Shell | 840D TPU laminated, RF welded |
| Waterproof Rating | IPX7 — immersion to 1 m for 30 minutes |
| MOQ / Sampling / Production | 300 pcs / 7–10 days / 30–45 days |
A circle encloses more area for a given perimeter than any other shape. Applied to a gun case, the perimeter is the width of fabric consumed and the area is the volume available inside.
| Measurement | SL-E302 Circular | Typical Flat Case (30 × 8 cm) |
| Cross-sectional area | 491 cm² | 226 cm² |
| Perimeter (fabric width used) | 78.5 cm | 69.1 cm |
| Enclosed area per cm of perimeter | 6.25 cm² | 3.27 cm² |
| Volume over a 130 cm length | 63.8 L | 29.4 L |
| Volume ratio | 2.17 × | 1 × |
For 14% more fabric across the perimeter, the circular section encloses 2.17 times the volume. Measured per centimetre of fabric consumed, the tube is 1.9 times more efficient — which is why a 60 L case weighs 1.35 kg rather than the mass a flat case of equivalent capacity would require.
Gear stacked in a truck bed, a case wedged under a boat bench, and a pack compressed against a bulkhead all apply the same kind of external pressure.
A flat panel under pressure works in bending. The load concentrates at the centre of the panel and at the folded edges, and both are the points where a flat case dents, creases permanently, or splits along a seam. A circular section under pressure distributes the same load as tension around its circumference, with no single point carrying a concentration.
| Loading Behaviour | Circular Section | Flat Section |
| Force distribution | Tension around the full circumference | Bending concentrated at panel centre and edges |
| Crease formation | No fixed fold line; contact point rotates | Creases at the same edges every time |
| Fatigue over repeated loading | Distributed; no repeated stress point | Accumulates at fixed crease lines |
| Glancing impact | Curved surface deflects | Flat face absorbs squarely |
| Torsional stiffness along the length | High — closed circular section | Low — flat section twists |
Torsional stiffness is the property most often overlooked. A closed circular section resists twisting along its length far better than a flat one, which is what keeps a 130 cm case from wringing itself around a firearm when it is lashed to a moving vehicle.
A contoured case has one correct orientation. The stock, receiver, and barrel each have to land in their intended section, which requires the user to identify the correct rotation before inserting the firearm.
A circular section has no correct orientation — the cross-section is identical at every angle around the axis. The firearm goes in whichever way it happens to be held, through a mouth that opens to a full 39 cm flattened width.
• No rotational alignment required, in the dark or with cold hands
• Full-width top opening rather than a tapered mouth
• Accepts varied firearm profiles without a dedicated internal shape
• Scoped rifles, bipods, and extended magazines clear the opening without being threaded past a contour
• Same procedure regardless of which firearm from a fleet is being cased
The 25 cm internal diameter is uniform along the full 130 cm length, so the clearance available at the receiver is the same as at the muzzle.
| Item | Clearance Consideration |
| Bolt-action rifle with scope | Uniform 25 cm diameter clears optic and mount without a dedicated recess |
| Rifle with bipod attached | Folded bipod clears within the section; confirm at sampling for wide models |
| Shotgun with extended magazine | No taper at the muzzle end to restrict a magazine tube |
| Mixed fleet | One internal profile serves every firearm in a rental or club fleet |
| Accessories alongside the firearm | Remaining volume within the 60 L capacity takes ammunition, cleaning kit, or optics case |
A contoured case narrows toward the muzzle, which is where extended magazine tubes and long barrels run out of room. The tube does not narrow.
A tube is formed with a minimal seam layout — fewer joins than the multiple shaped panels a contoured case requires. The body is cut from 840D TPU-laminated fabric and closed with RF welded seams, leaving no stitch perforations anywhere in the waterproof shell and no seam ridges pressing against the firearm inside.
• Minimal seam count compared with multi-panel contoured construction
• Reinforced circular welded base takes ground and deck abrasion
• Carry points on welded reinforcement patches rather than sewn through the shell
• Smooth interior with no seam ridges or exposed stitching
| Item | Specification |
| Model Number | SL-E302 |
| Product Name | Tubular Waterproof Gun Case |
| Body Geometry | Cylindrical, uniform circular cross-section |
| Internal Diameter | 25 cm |
| Cross-Sectional Area | 491 cm² |
| Body Length | 130 cm |
| Usable Capacity | 60 L |
| Net Weight | 1.35 kg ± 0.15 kg |
| Shell Material | 840D TPU laminated (500D PVC / 420D TPU optional) |
| Seam Construction | RF welded |
| Closure | Roll-top, three folds, POM side-release buckles |
| Waterproof Rating | IPX7 — immersion to 1 m for 30 minutes |
| Max Firearm Length | 50 in (127 cm) |
| Empty-State Storage | Rolls flat |
| OEM / ODM | Supported |
| Component | Material | Function |
| Tube Shell | 840D TPU Laminated | Waterproof barrier; abrasion resistant; weldable |
| Seams | RF Welded | Minimal seam count; no stitch perforations |
| Base | Reinforced Circular Welded Base | Ground and deck abrasion at the standing end |
| Reinforcement | Welded Patch | Carry load transferred without piercing the shell |
| Buckles | POM Side-Release | Corrosion-free closure hardware |
| Webbing | Heavy-Duty Nylon | Carry, compression, and lashing points |
| Option | Available | Notes |
| Tube Diameter | ✔ | Adjusts internal clearance for optics and accessories |
| Tube Length | ✔ | Matched to target firearm range |
| Shell Material | ✔ | 840D TPU / 500D PVC / 420D TPU |
| Logo Printing / Welded Patch | ✔ | Applied without piercing the shell |
| Pantone Colour Matching | ✔ | Confirmed at sampling |
| Camouflage Pattern | ✔ | Marsh, timber, or customer pattern |
| Lashing Point Configuration | ✔ | For vehicle, boat, or pack attachment |
| Packaging / Private Label | ✔ | Colour box, printed carton, hang tag |
The tubular format is specified where cases are stacked, wedged, lashed, or loaded quickly:
Boat decks and under-bench stowage, truck beds and vehicle cargo areas, aTV and snowmobile transport, guide and outfitter fleet use with mixed firearms, duck and waterfowl hunting in flooded terrain, kayak and canoe transport, pack-in backcountry hunting, and rental programmes handling many firearm profiles.
1. 840D TPU fabric inspection and weldability confirmation
2. Welding parameter setup for the fabric batch
3. First-article weld sample and destructive peel test
4. Precision cutting of tube panels to the circular development
5. RF welding of the cylindrical body seam
6. Reinforced circular base welding
7. Welded patch application at carry and lashing points
8. Buckle, webbing, and strap assembly
9. Dimensional and immersion verification
10. Final quality inspection and export packing
| Inspection Item | Standard |
| Incoming Material Inspection (IQC) | Every batch |
| First-Article Weld Peel Test | Start of every run |
| Welded Seam Integrity | 100% |
| Diameter and Length Verification | Sampling |
| Base Weld Inspection | 100% |
| Roll-and-Seal Function | 100% |
| Immersion Verification | Per approved sampling plan |
| Packaging Inspection (OQC) | 100% |
| Test Item | Method | Result |
| Compression Load | Weighted load applied across the tube body | Shape recovered; no permanent deformation |
| Stacked-Load Simulation | Cases stacked under sustained weight | No crushing or seam stress at contact points |
| Torsional Load | Twisting force applied along the 130 cm length | Closed section resisted wringing; contents held aligned |
| IPX7 Immersion | Sealed and immersed to 1 m for 30 minutes | No ingress at seams or closure |
| Roll-Flat Cycle | Repeatedly rolled flat and re-expanded | No cracking or delamination of the tube wall |
| Base Abrasion | Standing end dragged across gravel and decks | Cosmetic wear only; base weld intact |
| Anchor Point Load | Sustained load on welded lashing patches | No separation of the welded reinforcement |
| Low-Temperature Handling | Rolled and loaded after 12 h at -20°C | Tube wall remained pliable, no brittle cracking |
| Factor | Tubular (SL-E302) | Contoured Case |
| Volume per unit of fabric | 6.25 cm² per cm perimeter | 3.27 cm² per cm perimeter |
| Load handling | Tension around circumference | Bending at panel centre and edges |
| Crease fatigue | No fixed fold line | Repeats at the same edges |
| Torsional stiffness | High, closed section | Low, twists along length |
| Loading | No alignment required | Firearm must be oriented |
| Muzzle-end clearance | Uniform 25 cm throughout | Tapers, restricting magazine tubes |
| Seam count | Minimal | Multiple shaped panels |
| Retail appearance | Utilitarian tube | Gun-shaped silhouette |
A contoured case reads as more tailored on a shelf. A tube performs better once it is loaded, stacked, and lashed. Buyers generally choose based on whether their market prioritises shelf appeal or field durability.
| Item | Specification |
| Individual packing | PE protective bag |
| Carton | 132 × 32 × 32 cm, 4 pcs, 5.4 kg net |
| Empty-state storage | Rolls flat, no fixed volume retained |
| MOQ | 300 pcs |
| Sample lead time | 7–10 days |
| Production lead time | 30–45 days |
| Trade terms | EXW / FOB / CIF |
| Certifications | ISO 9001, BSCI, SMETA, GRS (material dependent) |
| Included Item | Quantity |
| Tubular Waterproof Gun Case (SL-E302) | 1 |
| Adjustable Removable Shoulder Strap | 1 |
| Backpack Straps | 1 set |
| Sealing Instruction Card | 1 |
| PE Protective Bag | 1 |
• 12-month warranty against manufacturing defects, including welded seams and base
• Replacement POM buckles supplied for dealer service programmes
• Diameter and length consultation for specific firearm ranges
• Welding parameter records retained per project for OEM quality files
• Electrode tooling development for custom diameters
Project:
Diameter Specification for a Mixed Rental FleetA rental operation running scoped bolt-action rifles alongside shotguns with extended magazine tubes had been stocking two contoured case models, because neither profile fitted the other firearm type. Staff were matching cases to guns at issue and re-matching them at return.
A single tube with a uniform 25 cm internal section accepted both. The order specified numbered identification patches so cases stayed with their assigned firearm, and the operation retired the second case model.
• Customized features: 25 cm uniform diameter, numbered welded ID patches, lashing point configuration for boat racks
• Outcome: Two case models consolidated to one; issue and return handling time reduced across the fleet
“One internal profile for the whole fleet ended the sorting problem. Any case takes any gun.”
— Fleet Manager, Rental Operation
“Our shotguns with extended tubes never fitted a contoured case properly. There is no taper on this one, so the magazine has room.”
— Head Guide, Waterfowl Outfitter
“They get stacked under decoys and gear on the deck all season. A flat case would have creased along the same edge by now.”
— Charter Operator, Boat Hunting
A circle encloses more area per unit of perimeter than any other shape. The 25 cm section encloses 491 cm² against roughly 226 cm² for a typical flat case, which over a 130 cm length is 63.8 L against 29.4 L — 2.17 times the volume for 14% more fabric across the perimeter.
Loaded, it is bulkier in profile. Empty, it rolls flat and retains no fixed volume, while a contoured case keeps its shape. For storage and transport the tube is the more compact of the two.
A circular section distributes pressure as tension around its full circumference rather than as bending concentrated at a panel centre and folded edges. In compression testing the shape recovered with no permanent deformation.
It is resistance to twisting along the length. A closed circular section resists wringing far better than a flat one, which keeps a 130 cm case from twisting around the firearm when it is lashed to a moving vehicle or boat.
The 25 cm internal diameter is uniform along the full length, so clearance at the receiver equals clearance at the muzzle and an optic clears without a dedicated recess. Diameter is customizable for larger optic and mount combinations.
Yes. A contoured case narrows toward the muzzle, which is where extended magazine tubes run out of room. The tube does not taper, so the magazine has the same clearance as the receiver.
There is no rotational alignment to get right — the cross-section is identical at every angle around the axis, and the mouth opens to a full 39 cm flattened width. That matters most in the dark, with cold hands, or when casing a fleet of different firearms.
No fixed fold line exists, so the contact point rotates with handling rather than fatiguing the same edge. Repeated roll-flat cycling in testing produced no cracking or delamination of the tube wall.
A tubular layout uses a minimal seam count compared with the multiple shaped panels of a contoured case. Fewer seams means fewer potential failure points and a smooth interior with no ridges against the firearm.
Yes. Both diameter and length are customizable, and electrode tooling is developed in-house for custom sections. Buyers commonly run two or three diameters to cover different firearm categories.
Welded lashing patches take a strap or line, and the lashing point configuration is customizable. The circular body settles under its own contents rather than sitting proud on a curved deck.
MOQ 300 pcs, samples in 7–10 days, production in 30–45 days, quoted EXW, FOB, or CIF. Full OEM and ODM development is supported including diameter, length, material, branding, and packaging.
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