SMALL PRINT:
Registration only valid once per day, per email address. A backpack will be awarded each day of the promotion to someone at random from the pool of that day's submissions. Odds of winning a backpack depend solely on the number of participants. Winners will be notified by email. No cash value. Substitutions may occur if necessary.
FULL GIVE-AWAY RULES:
Eligibility Requirements. To be eligible to participate, Backpack-A-Day Give-Away entrants must be U.S. residents age 21 or older that have a valid U.S. mailing address to which prizes can be delivered. Employees of Altrec, Inc. and participating Altrec.com vendors, and the employees' immediate families, are not eligible to participate in the Give-Away.
How to Enter. To enter, you must sign up to recieve Altrec.com's Dispatch e-mails.
Limit of one entry per person. OK, I give up. . .this seems to contradict the earlier notation that you can enter daily! 
Submission of invalid or incorrect information, including email addresses, shall make an entry void. Altrec, Inc. is not responsible for incomplete, inaccurate, lost, or otherwise deficient or unusable entries.
Selection and Notification of Winner; Odds of Winning. A winner will be selected for each day the giveaway runs from eligible participants actively receiving Dispatch e-mails. Odds of winning a backpack depend solely on the number of participants. Winners will be notified by email around 10 days after the closing of each promotion. A complete list of winners can be obtained by contacting Altrec.com at 541-316-2400. Winner will be notified via email and/or phone call. If the winner fails to respond within 72 hours of notification, their winnings may be forfeited and another winner selected.
Prizes. One winner per day will be chosen to receive the Backpack for the Give-Away. Backpack color, size, and style are subject to availability. If the described backpack is not available, then another of equal value will be awarded. There is no cash value.
http://www.altrec.com/backpackgiveaw...5ndlfzfbgtfFnd