How the Lobster Inn One-Way Flap Bag Works

In the world of underwater hunting, small design flaws in your gear can lead to big losses — especially when it comes to lobster diving. Most divers have experienced the frustration of watching a lobster wriggle free due to a faulty zipper, worn-out Velcro, or clumsy drawstring.

That’s exactly why Keystone Dive Products created the Lobster Inn Bag, featuring a patented one-way flap — a smart, diver-designed system that makes inserting and securing your catch fast, safe, and frustration-free.

In this article, we break down how the one-way flap works, what makes it different, and why it’s become the preferred choice for divers across Florida and beyond.

The one-way flap is a flexible entry mechanism built into the opening of the bag. Instead of requiring zipping or manual closure, it uses a tapered inner flap that opens in one direction — inward.

Here’s how it works:

The diver pushes the lobster through the flap, which opens under pressure
The flap automatically closes behind the catch, creating a one-way entry
The lobster cannot escape, even if the outer bag is moved, jostled, or opened

It’s a simple but highly effective design, especially in dynamic or fast-paced dive environments.

1. One-Handed Operation

No need to stop and fumble with zippers or cords — just guide the lobster in and move on. This is critical when diving in current or at depth where efficiency equals safety.

2. No Moving Parts to Fail

Zippers jam. Velcro wears out. Drawstrings tangle. The one-way flap uses no metal or mechanical components, making it far more reliable long-term.

3. Prevents Escape, Even When Open

If you’ve ever opened your bag to insert a new catch, only to lose two others, you know the pain. The one-way flap keeps all previous catches contained — no backflow, no unexpected losses.

4. Dive-Friendly Design

Works with gloves
Operates in low visibility
Rinses clean and dries quickly
Lightweight and low-drag in the water

The Lobster Inn Bag from Keystone Dive Products is the original one-way flap catch bag — the design was developed, tested, and patented by real Florida divers who experienced firsthand the shortcomings of traditional bags.

It’s not just about novelty — it's about functionality:

Secure catch retention
Streamlined underwater performance
Ease of use for both beginners and pros

We patented the design to protect the innovation and ensure it’s available to serious divers who want equipment they can trust.

Feature	Traditional Bag	Lobster Inn One-Way Flap
Entry Method	Zipper, Velcro, Drawstring	Flexible inner flap
Operation	Two-handed	One-handed
Risk of Escape	High (especially when open)	Extremely low
Durability	Can fail due to salt, sand, wear	Long-lasting, no mechanical parts
Speed	Slower to open/close	Fast insertion on the go
Ideal For	Casual divers	Recreational and serious divers

Can fish or lobster get back out once inside?

No. The one-way flap prevents backflow. Once a lobster is inside, it cannot escape unless you deliberately open the bag.

Is the flap easy to open with gloves?

Yes. The flap is flexible and pressure-sensitive, so you can insert catch without needing to manipulate any closure — even with thick gloves.

Will this flap work for lionfish or scallops?

Yes. Many divers use it for lionfish, scallops, and crabs. For lionfish, we recommend using a rigid or puncture-resistant liner inside for added safety.