I bought one of these Walmart.com: Stanley Pro Mobile Tool Chest: Tools
it is large enought to hold my saddle but I do not use it for that. I have my extra bridles, halters, lead ropes, reins, as well as anything that people might go.."no one uses this, so they won't notice if it disappears." I also put my fly sprays, shampoos, medications, and similar stuff as well as more expensive items such as clippers and boots in there. It has a removable tray that works great as a grooming tray. And had a built in lock as well as 2 places for padlocks. It has a extendable handle and wheels for easy mobility.
I am in a barn where I trust everyone fully, however if some how someone else got in there I would hate to have my stuff disappear. I have a McClellan saddle and just run a bike lock through the opening and around the suppost of the saddle rack so it does not walk away. I leave my handmade rope halter out (cost me a whole 75 cents to make), as well a "well loved" but sturdy nylon halter as well as a cheap no frills cotton lead rope so my horse can be caught and handled.
Everyone else there leaves their stuff out in the tackroom and have not had any problems. I guess my over protectiveness coems from not having a lot of $ and living in a horrible part of the city where if it isn't locked up it is gone. My family is also not horse friendly and do not agree with it what so ever all horse stuff must be kept at the barn and to have a lifetime of horse stuff hoarding to get stolen would be terrible.