DIY Dive Catch Bag: Build One in an Afternoon (Step-by-Step)

As an Amazon Associate I earn from qualifying purchases. This page may contain affiliate links.

A DIY dive catch bag is a mesh bag you sew or assemble yourself to carry small items you collect underwater, such as trash, shells, or lost gear. With basic materials and a few measurements, you can build one that fits your gear and your dive plan in an afternoon. This guide walks through choosing materials, sizing, assembly, and safe use.

Why Build Your Own Dive Catch Bag?

Off-the-shelf catch bags are often sized for general use, and many divers find the handle placement or bag depth doesn’t suit their habits. Building your own lets you control the mesh size, opening width, and attachment point. It also gives you a way to make a bag that suits the specific debris or specimens you expect to encounter, whether that’s fishing line, bottle caps, or small reef-safe finds you’re allowed to collect.

Before you start, check local rules. Many marine protected areas prohibit collecting anything at all, and some regions require permits for removing debris. Always confirm what you’re permitted to pick up.

Materials and Tools You Need

Choose materials that hold up to saltwater, sunlight, and repeated rinsing. Avoid untreated cotton or standard polyester thread, which degrade quickly. Look for UV-resistant, marine-grade components.

• Mesh fabric: knotless nylon or polyester mesh with openings around 5–10 mm for general debris. Smaller mesh holds tiny items but restricts water flow and is harder to clean.
• Webbing or stiff binding tape for the rim and handle, rated for saltwater (nylon or polyester).
• A heavy-duty drawstring or bungee cord for closing the top.
• Stainless steel or marine-grade plastic D-rings or a snap hook for attaching the bag to your BCD.
• UV-resistant polyester or nylon thread, sized for heavy use.
• Sewing machine capable of heavy-weight fabric, or a sturdy hand-sewing needle and waxed thread.
• Measuring tape, marker, scissors or a rotary cutter, and a lighter or heat sealer for cut edges.

Step 1: Decide on Size and Shape

Size the bag to what you’ll actually carry. Most recreational divers find a bag that holds roughly 5 to 10 liters comfortable. A larger bag gets heavy quickly once it’s full of wet material, and it can snag on reef structure or fill your hands.

Bag Size	Approximate Volume	Best Use
Small (approx. 20 × 25 cm)	4–5 liters	Fishing line, small debris, lost small items
Medium (approx. 25 × 35 cm)	7–9 liters	General debris, bottle caps, plastic bags
Large (approx. 30 × 45 cm)	12–15 liters	Bulkier debris; heavier when wet, so use with care

Cut a rectangle of mesh twice the height you want, then fold it in half to form the body and sides. For a simple bag, a single rectangular piece of mesh sewn into a tube with a bottom seam works well.

Step 2: Cut and Prepare the Materials

Measure carefully and mark all cut lines before you cut. Heat-seal or fuse the edges of synthetic mesh so it doesn’t fray. Cut your webbing for the rim and handle, adding about 5 cm extra on each end for overlap and finishing.

Cutting the Mesh

• Cut one main piece to your chosen height plus 4 cm for the top hem.
• Cut one bottom piece to match the width, or fold the mesh to avoid a bottom seam.
• Seal all cut edges with a lighter or heat tool, moving quickly to avoid scorching.

Preparing the Rim and Handle

• Cut a length of webbing equal to the bag’s opening circumference plus 5 cm for overlap.
• Cut a handle strap roughly 30–40 cm long for a clip-on bag, or longer if you want to hang it from your hand.

Step 3: Assemble the Bag

Sew the side seam first, then add the bottom and rim. Use a double-stitched seam or a flat-felled seam, since single stitching tends to fail under load.

1. Fold the main mesh piece in half, right sides facing, and sew the side seam with a 1 cm allowance.
2. Sew the bottom closed, or use a seam at the base if you cut two pieces.
3. Fold the top edge down about 2 cm and sew a channel for the drawstring, leaving openings at the ends.
4. Wrap the webbing around the opening, sewing it on in a continuous loop to reinforce the rim.
5. Thread the drawstring through the channel and tie off the ends.
6. Attach the handle strap to two points on the rim, then add the D-ring or snap hook at the handle’s free end.

Reinforcing Stress Points

The handle attachment points and the bottom corners take the most load. Add a second row of stitching or a small square of webbing on each stress point. For a bag you expect to fill heavily, consider a bar tack (a dense zigzag stitch) at each handle anchor.

Step 4: Attach and Test the Bag

Clip the bag to a D-ring on your BCD or to a waist-level attachment point. Keep it low enough that it doesn’t swing into your fins or snag on the reef. Before diving, fill the bag with a few pounds of wet material in a pool or shallow water to check the seams and handle.

Check the bag’s weight when full. If it’s hard to lift with one hand, reduce its size or add a second attachment point.

Common Mistakes to Avoid

• Using untreated cotton or standard polyester thread. Both break down in saltwater and sunlight.
• Making the mesh too fine. Fine mesh traps water and becomes heavy and hard to rinse.
• Skipping the reinforcement at handle points, which is where most DIY bags fail.
• Attaching the bag too high, where it can tangle with your inflator hose or regulator.
• Leaving sharp cut edges unsealed. They fray and can snag on gloves or skin.
• Overloading the bag. Sharp or heavy debris can tear mesh, so keep items within the bag’s rated load.

Tips for Safe and Practical Use

• Rinse the bag in fresh water after every dive to remove salt and grit, which wear down stitching over time.
• Dry the bag fully before storage and keep it out of direct sun for long periods.
• Inspect seams and webbing before each dive. Replace any frayed webbing immediately.
• Don’t carry sharp or hazardous objects loose. Use a separate container or tool for items like broken glass or fishing hooks.
• Stay within your training and buoyancy control. A full bag changes your trim, so adjust your weighting if needed.

Recommended Gear

If you’d rather buy some of the components than source them separately, these items help with the most common parts of a DIY build.

• Stainless steel snap hook with swivel: A corrosion-resistant clip that lets you detach the bag quickly and rotate it away from your body. View on Amazon
• Marine-grade nylon webbing: Saltwater-rated strap material for rims and handles that resists UV and abrasion better than general-purpose webbing. View on Amazon
• Heavy-duty UV-resistant thread: Polyester or nylon thread designed for outdoor and marine use, which holds seams longer than standard sewing thread. View on Amazon
• Knotless nylon mesh fabric: A durable mesh that won’t snag as easily as knotted netting and rinses clean after each dive. View on Amazon

FAQ

What size mesh is best for a DIY dive catch bag?

Mesh openings of about 5 to 10 mm work well for general debris. Finer mesh holds smaller items but traps water and is harder to clean.

What material should I use for the bag?

Knotless nylon or polyester mesh is the most common choice because it resists saltwater, UV exposure, and abrasion.

How much weight can a DIY catch bag hold?

It depends on the seams, webbing, and stitching. Keep the bag light enough that you can lift it comfortably with one hand, and reinforce the handle points for heavier loads.

Can I use a regular sewing machine?

Yes, if it can handle heavy-weight synthetic fabric and thick thread. A heavy-duty or denim-capable machine is ideal, and a hand-sewn bag with waxed thread is also workable for smaller bags.

How do I clean and store the bag?

Rinse it in fresh water after every dive, then dry it completely away from direct sunlight. Store it loosely folded so the seams don’t stay under tension.

Where should I attach the bag on my gear?

Clip it to a D-ring on your BCD at a height that keeps it clear of your fins, regulator hose, and inflator. Some divers prefer a leg or hip attachment for stability.

Are there rules about collecting underwater?

Yes. Many areas restrict or prohibit collecting, and some require permits. Check local regulations before diving and only collect what you’re permitted to remove.

Do I need training to use a catch bag?

A catch bag is a simple tool, but a full bag affects buoyancy and trim. Practice buoyancy control with a loaded bag in controlled conditions, and consider a course if you plan to do debris removal regularly. For diving-specific safety guidance, consult a certified instructor.

Conclusion

A DIY dive catch bag gives you a practical, customizable tool built around your own dive habits. Focus on saltwater-rated materials, reinforce the handle points, and size the bag to what you’ll actually carry. With regular rinsing and careful inspection, a homemade bag can serve you for many dives.

About the author