I have to replace one of the compartment lids on my bass boat and I figured I could use marine plywood then put carpet and all over it. Problem is I don't have access to anyone with it unless I order it. Is there anything other than that, that I could use that isn't to expensive? thanks guys

The only difference between marine plywood and regular exterior plywood is that marine plywood does not have any voids in the layers.

There are several grades of regular exterior plywood such as AC, plug touched and sanded, etc. AC plywood will have one good side with no flaws (the A surface) while the C surface can have defects which have been filled with football shaped plugs or other voids which have been filled. Exterior sheathing used in building homes will have voids on both surfaces. There is also furniture grade plywood which has a surface layer of various types of wood, oak, mahogany, cherry, maple, etc.

Exterior plywood is bonded with the same adhesive as marine grade. The problem with using exterior plywood in your application is that you may have an interior void where you need to place a latch, or the gas piston which holds the lid open. The hinge isn't as critical since in most cases it is a piano hinge, so a screw here and there in a void is not a serious problem.

While marine plywood is more expensive, it could end up being more economical.

One other thing. If you do go with exterior plywood, avoid the plywood made up of the thicker, and thus fewer layers of wood. It will not be as stiff or as strong as the same dimension of plywood that has more plies, nor will it be as stable.

Alright awesome. That's what I was needing to know. Thanks for your help.