I assume that we are talking .zip here Any free or payed site that would allow .zips (some dont ) could be used. Most of these sites have quite a bit of storage space. Give each of your .zips a long random alpanumeric name ( hrtreh834gr94 gfjgr09re.zip) Email the url to customer http://www.mysite.com/hrtreh834gr94 gfjgr09re.zip That way you can keep a track on what is going on ??