I use a travel toothbrush holder to hold my paper piercer and Xacto knife. I put a makeup sponge wedge in the bottom, so I can just shove the paper piercer in there and it won't damage the tip or the plastic case. I also put rubber pencil grips on both of these so they're more comfortable when I use them for a long time. I like this case because I can put the lid on and slide it in any bag without poking anything!
Oh, TIP - if you put rubber pencil grips on yours DO NOT put the case right next to where you heat emboss!! I accidently melted mine last week and it's NASTY! LOL