I recently noticed that I was sent a 5 pack of Astra SP blades with one of the razors I bought. These were double wrapped. I like them so I ordered a 100 pk. somewhere, which really don't remember where I got them. I noticed these were in plain white single wrapped. Are there any difference in these blades?.Just curious. My Astra SS blades are also in plain white wrappers. Like some feedback. Thanks!