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My thought was that using a plastic bag means that you are trapping air(buoyant) in with the weight. What about using the fabric type of window screen material so that water goes in but no shot comes out?
DIY SCUBA soft weight
3rd mechanical Iris with very thin leaves!
How to make a 12 leaves Mechanical Irirs
Hidden Bookshelf Light Switch
Tiffin Box from Tuna Cans
Black & Decker High Speed Rotary Dremel Tool Mod
How To Tighten Up A Sloppy Second Hand Dremel
Railroad Track Anvil
Make a ring by melting pennies.
A Precise Table Saw from an Electric Hand Saw
Mini-Tablesaw / Router / Shaper for Dremel rotary tool
Hamper Light Box
Make a good, cheap, upgradeable sheet plastic vacuum former
Aluminum Bottle Alcohol Stove
Instructables Labs' Vacuum Former (STEP VERSION)
Make Life Better with a Sailboat-in-a-Closet
The Near-Perfect Tent: Design and Build a Recycled Tent
Survival Bracelet (Updated!)
Paracord Bracelet with Monkey Fist Button