L400 Mesh Ultra-Portable ITX Case - Compact High-Airflow Design

Our review of the L400 Mesh Ultra-Portable ITX Case finds it is an excellent choice for users who need desktop-class GPU performance in a truly compact, portable chassis. The strongest reason to buy is its combination of a 12.1L vertical footprint with support for triple-slot GPUs up to 350mm, meaning it can house cards like RTX 4060/4080 while taking minimal desk space and weighing just 5.5lbs. For gamers, content creators, and LAN-goers who value airflow and mobility, the L400 balances portability and cooling without the bulk of a traditional tower.

Key Features

• Ultra-Compact Vertical Design: The 12.1L chassis (198 x 169 x 363mm) saves desk space while still fitting triple-slot GPUs up to 350mm long for desktop-grade graphics performance.
• Advanced Mesh Cooling System: Full-perforation steel mesh panels support up to three 140x15mm ultra-slim fans to drive side-to-top airflow and help keep CPU and GPU temperatures under control.
• GPU-Ready Plug-and-Play: Includes a dual reverse PCIe 4.0 riser and a 1.5m DisplayPort 1.4 cable to simplify GPU installation and support high-refresh external displays without signal loss.
• Rugged Yet Portable Frame: High-density steel construction with reinforced corners, anti-vibration feet, and a side-mounted steel handle makes it durable and easy to carry to LAN events or travel.
• Expandable I/O and Power Options: Front panel Type-C (10Gbps), two USB 3.0 ports, a 2-in-1 audio jack, and compatibility with ATX/SFX/SFX-L PSUs plus two 2.5in SSD mounts offer flexible connectivity and storage upgrades.

Who It's For

The L400 suits gamers, creators, and professionals who need a compact system that still accepts full-length, triple-slot GPUs and wants strong airflow for long sessions of gaming or rendering. Its light weight and steel handle make it ideal for LAN parties, dorms, or frequent movers who do not want to compromise on GPU power.

It is less suitable for users who need large internal cooling radiators, tall tower-style CPU coolers, or many internal drive bays; buyers requiring extensive internal storage or water-cooling loops should consider larger cases instead.

Pros & Cons

Pros

• Exceptional space efficiency that still accepts long triple-slot GPUs up to 350mm.
• High airflow thanks to full-perforation mesh panels and support for three ultra-slim 140mm fans.
• Includes a PCIe 4.0 riser and DP 1.4 cable for straightforward GPU setup and high-refresh displays.
• Lightweight steel frame with a handle and anti-vibration feet for durable portability.

Cons

• Limited internal space means no room for large internal radiators or many drive bays, so expansion is constrained.

Specifications

Case Volume	12.1L
External Dimensions	198 x 169 x 363mm (7.8in x 6.65in x 14.41in)
Maximum GPU Length	350mm (triple-slot)
Included Accessories	PCIe 4.0 riser cable, DP 1.4 cable, steel handle, installation manual
Front I/O	1x USB Type-C (10Gbps), 2x USB 3.0 (5Gbps), 1x 2-in-1 audio
PSU Compatibility	ATX, SFX, SFX-L supported
Weight	Approximately 2.5kg (5.5lbs)

Our Verdict

The L400 Mesh Ultra-Portable ITX Case is a strong pick for anyone who wants a genuinely portable mini-ITX build without giving up full-length, triple-slot GPU capability and effective airflow. With included PCIe 4.0 and DP 1.4 cabling, rugged construction, and a compact 12.1L footprint, it offers excellent value for gamers and creators who prioritize mobility and cooling over maximum internal expansion.

Frequently Asked Questions

Will the case fit an RTX 4080?
Yes, it supports triple-slot GPUs up to 350mm long, which covers commonly sized RTX 4080 cards that meet those dimensions.

Are fans included?
No, fans are sold separately; the case supports up to three 140x15mm ultra-slim fans behind the mesh panels for optimized airflow.

Which PSUs fit this case?
The L400 is compatible with ATX, SFX, and SFX-L power supplies, giving flexibility depending on component choices.