Why BCP creates such big files?

I'm creating some reports via BCP to be sent via emails. create TABLE ##tempsss ( create TABLE ##JOB_DataAssociacao_verContrato ( F1 VARCHAR(6) ,F2 VARCHAR(200) ,F3 VARCHAR(22) ,F4 char(1) ,F5 varchar(10) ,F6 varchar(15) ,F7 varchar(30) ,F8 varchar(10) ,F9 VARCHAR(18) ) --it needs to be varchar to be able to use header ) insert into ##tempsss SELECT ...fields... FROM some table or view go ------------------------------------------------------------- --passo 2 -- exec xp_cmdshell 'bcp "select ''field1'',''field2'',''field3'' UNION ALL select * from table or view" queryout "filepath\filename.xls" -U sa -P password -w -S servername' ------------------------------------------------------------- EXEC msdb.dbo.sp_send_dbmail @profile_name = 'dba profile or something', @recipients = 'recipients email', @subject = 'email subject', @file_attachments='path\filename.xls' ------------------------------------------------------------- drop table ##tempsss with a 9k rows, I have a 2mb file. I just copy the content of this file, and paste inside an empty excel file and I have 160KB. how can I use bcp but creating smaller files? I'm havin gproblems to send files over 1mb via dbmail. I set dbmail to send files with 10mb+. smtp is ok too.