The PSK needs to stay pocket sized or you won't have it with you. As you accumulate "stuff" that you think you might want to have with you, it may make more sense to construct other kits.

In my case, I started with the requisit Altoids PSK - while constructing that I discovered that there wasn't enough room to fit a useable amount of First Aid supplies so I built an Altoids FAK. Walked around for a few weeks with an altoids tin in both front jeans pockets. I found that to be a bit irritating and also I discovered that I didn't have any really useable blade or shelter or the newest LED light I really liked or .... So I built a VSK around a Filson vest as Swhert suggested. Much more comfortable but the day came when it was too hot for the vest or I had to be in a different kind of attire and the vest wouldn't fit in. Once again I was forced to be unprepared in order to be socially acceptable. So I went to a kind of bag kit and it was large enough to grow quite rapidly and I reasoned that I would always have it in the car so I would be close enough to it. Well not so. How about the rail commute with a suit on? Dang-it. Well, long story somewhat shorter, I ended up keeping all of the kits and am happy for the redundancy. I now carry the Altoids PSK and FAK balanced in my front pants pockets and find that there is rarely a time when they look out of place. My legs have grown accustomed to them being there so no irritation. I also regularly wear the VSK and keep the belly bag kit in the car along with a EMT-Basic Jump kit FAK and a HAM setup. I no-longer have the over-sized 4X4 on steroids since it's engine siezed last fall during my un-employement. I haven't yet gotten the 55 gallon drums of gas and water though I do have a large stock-pile of bottled water and a lot of Dinty-Moore Beef Stew.