If your pocket knife is an essential to your EDC kit, you'll want to invest in WESN's new Pocket Sharpener to keep your edges in tip-top shape. The slim and compact sharpener is a combination of electroplated diamond 400 grit plate and a ceramic plate that are merged together for a dual sided tool that sharpens and refines your blades. The small size is a perfect alternative to the larger, bulkier options and pairs perfectly with the smaller knives that have become more popular in recent years. 

$35, wesn.com