Easy to make, waterproof dry bags. No stitching; just cable ties, duct tape and super tough Tyvek. - YouTube
Make Your Own Stuff Sack - BIKEPACKING.com
DIY @ RBTR - Roll Top Dry Bag Kit with Dyneema Composite Fabric - YouTube
DIY Advanced Dry Bags You can make dry bags to fit specific items, such as sleep pads, chairs, etc., by taking a few measurement
Roll-Top Drybag Kit - DIY Packraft
Make Your Own Stuff Sack - BIKEPACKING.com
OutdoorINK Roll Top Dry Bag Kit w/ Dyneema® | MYOG, DIY - Ripstop by the Roll
br>Rolling A Dry Bag
Ace Teah Waterproof Dry Bag - Roll Top Dry Closure Compression Sack Keeps Gear and Values Dry for Kayaking, Beach, Rafting, Boating, Hiking, Camping - Aceteah