How to list the content of a zip archive, but only the first level

I have a big zip file and I want to know what it's contain. I know I can run:

zipinfo file.zip

but the output is too verbose and there are a lot of files in the sub-directories.

I want to see a list of the files in the top level.

Example

If the normal output is:

-sh-3.2$ zipinfo file.zip
Archive:  file.zip   999999999 bytes   99999 files
-rw-r--r--  2.3 unx     3894 tx defN  3-Jul-11 13:11 file1
drwxr-xr-x  2.3 unx        0 bx stor 23-Feb-12 21:00 dir1/
-rw-r--r--  2.3 unx      269 tx defN 23-Oct-11 14:34 dir1/file2
drwxr-xr-x  2.3 unx        0 bx stor 25-Sep-11 03:53 dir1/subdir1/
...
drwxr-xr-x  2.3 unx        0 bx stor 23-Feb-12 21:00 dir2/
...

I want a command that will output:

-sh-3.2$  <answer>
Archive:  file.zip   999999999 bytes   99999 files
-rw-r--r--  2.3 unx     3894 tx defN  3-Jul-11 13:11 file1
drwxr-xr-x  2.3 unx        0 bx stor 23-Feb-12 21:00 dir1/
drwxr-xr-x  2.3 unx        0 bx stor 23-Feb-12 21:00 dir2/
drwxr-xr-x  2.3 unx        0 bx stor 23-Feb-12 21:00 dir3/
...