Dive, dive, dive...

Aim:
To make a boat to carry as much cargo as possible without sinking.
Materials:
1 length of Al foil, 10 straws, and 6 elastic bands.
Conditions:
Only the materials provided may be used. The boat, observed by the judges, must float for at least 10 seconds for a valid attempt. Once the cargo is loaded and the boat launched, it may not be touched until the measurement is completed. The boat may not touch the sides or bottom of the container while the measurement is in progress. You may launch your boat as often as you like.
Time Limit:
30 minutes
Ranking:
The ranking order will be determined maximum cargo carried in a single attempt