The box is large enough to hold a lot of mail and small packages, easily several weeks worth, unless you receive many packages.The box is very easy to install, the downside is that the included "lock" can be opened with a screwdriver. I replaced it with a key lock. It was not a simple exchange, since the the hole is larger than a standard mailbox lock. I used an old face plate from a deadbolt that fit a standard mailbox lock perfectly. I used 2 pop rivets and epoxy to attach the plate behind the existing hole. The lock now works well, and is more secure.The other security issue was that the arms that attach the security plate that drops to allow mail to enter the box are attached with 2 small bolts, easily removed. I replaced these bolts with 1/4" rivets designed to attach tool ends (like shovels) to their handles. Now it will take more than just a screwdriver to break into the box.