When deflated and in the sack (paddles come apart as well), the sack is about 35 lbs. (depending on what has been added like our life belts), it is larger than a filled kitchen trash bag, but not as large as an outside trash can.
I have kayaked in it with my daughter and 3 year old granddaughter and it was still above water level, but very calm waters. You can look at the Sea Eagle web site and it gives weight ratings.