Business stationary Design service required

We already have our logo and business card designed. Now we require a top designer to help us to design the following printing stationary:

1. official Envelop (little larger than A4 size),
2. Training certificate holder (folded to insert A4 size certificate)
3. Corporate document folder (with pocket to insert A4 size documents)
4. Roll up design

only qualified service provider with relevant experience in designing the above stationary need to apply. Kindly provide your sample work on similar projects / products designed before.

Regards,

Su