Containers and methods of using the same

A container comprising:

• (a) a container base comprising:
• a closed bottom end;
• an open top end;
• one or more locking bar elements on the base;
• and
• (b) a container cap comprising one or more engagement features that mate with the one or more locking bar elements.

A container comprising:

• (a) a container base comprising:
• a closed bottom end;
• an open top end;
• and
• (b) a container cap that releaseably mates with the container base.
• wherein one of the base or cap comprises a tab portion, and the other of the base or cap comprises an engagement feature configured to mate with the tab portion.

A container comprising:

• (a) a container base comprising:
• a closed bottom end;
• an open top end;
• one or more locking bar elements on the base;
• and
• (b) a rounded container cap comprising one or more engagement features that mate with the one or more locking bar elements.

A container comprising:

• (a) a container base comprising:
• a closed bottom end;
• an open top end;
• and
• (b) a cap that releasable engages with the container base upon engaging the base and cap,
• wherein at least one of the base or cap comprises an inner layer that provides enhanced engagement of the cap and base.