STL FLEXI LOCK DEEP NO. 4
- Model: LEAKPROOF
- JAN: 315
Available Options
Flexi-Lock Deep
Container No. 4, 700ml
A mirror-finished, food-grade stainless steel container built to be genuinely leakproof and airtight — with a deep body for larger portions and a secure flex-fit lid that seals without clips.
01 — Why It Matters
There's a quiet kind of luxury in never having to think twice.
In opening your bag mid-afternoon and finding everything exactly as composed as when you packed it. No stains bleeding across the lining. No faint, lingering scent that wasn't there this morning. No lid that gave way somewhere between home and wherever the day took you.
It's a small moment, easy to overlook — until you experience what it feels like when something is simply, dependably, well made.
02 — Introduction
Considered, down to the seal.
Introducing the Steeline Flexi-Lock Deep Container No. 4 — a 700ml stainless steel container crafted for those who've grown tired of storage that only performs some of the time. This isn't just another tiffin. It's a considered piece of everyday design: a mirror-finished, rust-free, food-grade steel body with a deep profile built for hearty portions — sealed by a flex-fit lid that locks in freshness without a single clip.
Steel, by nature, carries a kind of understated richness that plastic can't imitate — a coolness to the touch, a weight in the hand, a sense that this is an object built to be lived with rather than replaced. Available with a red or a blue lid, it reads less like a utility item and more like a small, deliberate addition to your daily rituals.
Despite its refined finish, this is a container engineered for real, repeated use — 100% leak-proof and airtight by design, tough yet remarkably lightweight, stackable, and fully reusable. The Flexi-Lock Deep Container No. 4 doesn't ask for your attention — it simply earns your trust, one seal at a time.
03 — The Problem
Most "leakproof" containers aren't.
The lid seats unevenly if you're not paying attention. Plastic bodies scratch, cloud, and start holding onto smells no amount of washing seems to fix. Cheaper steel options rust at the seams within a few months, quietly ruining the one thing you bought them for. And shallow containers force you to choose between a hearty portion and a lid that actually closes. So you compensate — the backup plastic bag, the double-check at the door, the sauces you stop packing altogether.
04 — The Solution
A seal that holds. Every time.
The mirror-finished, rust-free, food-grade steel body pairs with a flex-fit lid that presses into place with real intention — a 100% leak-proof, airtight seal that holds whether it's sitting upright in your fridge or tossed around in a backpack, no clips required. The deeper walls mean a curry, a stew, or a full pasta portion travels without a fight. Close the lid, and you're done.
05 — Why You'll Love It
Eight small details, all deliberate.
Seal
100% Leak-Proof & Airtight
Keeps food securely sealed inside, eliminating the risk of spills or leaks in transit.
Finish
Mirror-Finished, Rust-Free
Food-grade stainless steel that stays shining and resists rust with regular use.
Build
Lightweight & Portable
Despite its deep capacity, it stays easy to carry to work, school, or on outdoor adventures.
Freshness
Keeps Food Fresh Longer
The airtight seal preserves flavor, texture, and nutrition until you're ready to eat.
Hygiene
Prevents Bacteria Growth
The airtight, leak-proof design helps keep food hygienic, even over extended storage.
Capacity
Deep, Generous Capacity
Room for hearty meals, curries, stews, pasta dishes, or several smaller items at once.
Control
Reduced Spills
Deeper walls help contain liquid-based dishes and sauces during transport.
Storage
Stackable Design
Sits neatly alongside other containers, saving fridge and shelf space.
06 — Perfect For
07 — Household Uses
One deep container. A lot of dinners.
The deeper walls mean this one leans toward full meals and liquid-based dishes rather than small portions — a few of the ones it settles into most.
Kitchen & Pantry
Meal Prep & Lunchboxes
Travel & Outdoors
08 — Quick Highlights
09 — Technical Specifications
| Product Name | Flexi-Lock Deep Container No. 4 |
| Brand | Steeline |
| Material | Food-Grade Stainless Steel (Mirror-Finished, Rust-Free) |
| Lid | Flex-Fit Lid (No Clips) |
| Dimensions | — cm x — cm |
| Height | — cm |
| Capacity | 700 ml |
| Other Features | Stackable, Lightweight, Bacteria-Resistant Seal |
11 — Ready?
Stop double-checking your bag for spills.
Add the Flexi-Lock Deep Container No. 4 to your cart today!