I now have a pre-made crop kit. It contains such things as scissors, adhesive (and refills), a ruler, a small paper trimmer, etc. In other words, the things you KNOW without a doubt you're going to be using. That way, you can just grab it and know your basic kit is already put together. Then you only have to worry about your photos, paper, etc. It sounds like a small thing, but I'll bet there are people here who have arrived at a crop only to realize they've forgotten something "basic". Just remember to restock it when you get home so it's ready to go next time.