This project is for a pouch, indended to stow my dinghy lift line. The dinghy block-and-tackle typically uses 50ft of line, which if not stowed properly is going to get tangled somwhere. I am not showing dimensions for this project as they would vary so much depending on how you intend to use this pouch. Instead, I'll show you the basic design of the project, and leave it to you to size it for your needs. The exploded view shows the basic design, which includes a vented area which allows the lift line to dry out.
Generally everything is made of Sunbrella, except for the Velcro pieces and the Phifertex vinyl mesh screen material. Binding is used for most surfaces to alleviate the need for hemming. As well, the binding "captures" the Phifertex vinyl mesh more securely.
Begin by making two small squares of Sunbrella and sew over the Phifertex at each end. Hemming may be used here as the Phifertex goes inside of the Sunbrella (sandwich style).
The back piece of the pouch is attached to the side Phifertex piece with the use of binding material. It is useful to actually sew the Phifertex sides to the back first, then go over the whole perimeter of the back piece with the binding. Note that the binding simply overlaps at the bottom of the pouch. The binding is made of Sunbrella as well, so any raw edges will ravel. To prevent this, use a hobby hot-knife to cut the end of the binding.
The front piece simply attaches to the sides by using the same binding method. Prior to sewing, it is useful to make alignment marks on the pieces with a piece of chalk so that you can check on the alignment when you run the piece through the sewing machine.
Back straps are made with pieces of Velcro, both for the top and side pieces. The top pieces use webbing of the same width as the Velcro, while the side pieces are a lamination of Velcro and Sunbrella. The Sunbrella may be hemmed for this piece.
The completed pouch simply attaches to the dinghy mounts with Velcro strapping. One issue to be mindful of is the Velcro straps are often made too short, so make them a bit longer than you think they should be. One pouch fits onto each dinghy mount.
The open pouch shows the dinghy lift-line coils up into the bag. The bag closes at the top with Velcro. An alternative closing method could be using snaps if you prefer, as the lift-line can actually snag on the Velcro.
The backside of the pouch shows the velcro mounting detail a bit more. The lower Velcro strap was made with 2" wide Velcro material.
Most of the material used for the pouches was scrap Sunbrella. Nevertheless, the cost of the pouches should not be more than perhaps $10 for each, and only a couple of hours of time. This is an easy one-day project for your boat.