i wish they would bring back the Gillette Techmatic.i had one in the Army-60's-and it was great.really sharp and no need to have blades handy,just turn the lever and a new section of the razor band would come into use.it had high and low settings,very handy when you had just a small kit. i used a mug and brush and still have the brush on a bathroom shelf..make sure you store it on the base..i got lazy and just tossed it in the mug and the brisles are sort of out of shape..another tip--if you use a straight razor don't run it under really hot water!..when you touch it to you skin the heat will make your hand jump and you might cut youself--i know..a wind-up razor might be handy for a BOB if you just need to get out of harms way for awhile.
i still have the Techmatic and got enought refills from ebay to have a shave with it once in awhile..