Rusty,

There are some pretty good suggestions for a small knife here:

Add a kinfe to DR/AMK PSK?

Hard to tell from the photo which SAK you have in your kit. Are you pretty set on something with multifunctions or are you just looking for nice small blade? I couldn't decide myself so in one PSK I have a Benchmade Benchmite that I crammed in there (fairly thin, lanyard hole, nice locking blade for a small knife, about $23.00). In another kit I have a SAK Classic with sterling silver scales (a gift) that seems thinner than its red counterpart.