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Paper and Envelope size guide

Paper sizes
A4
210 x 297mm
The same size as a regular piece of office photocopy paper.
Cut to your own specifications or use whole.
- fold or cut in half to fit into a C5 envelope
- fold or cut in three to fit into a DL (business sized) envelope
- fold or cut in four to fit into a C6 envelope
A5 
148 x 210mm
Half of A4.
- Fits flat into a C5 envelope
- or folded in half fits into an A6 envelope
A5 Overlay
138 x 200mm
Exposes a 5mm border on all edges when placed over an A5 backing card.

A6
105 x 148mm
Half of A5, Quarter of A4.
- Fits flat into an C6 envelope
Suggested uses:
- Invitation or Thank You card backing (card weight)
- RSVP 'Post card' (card weight)

A6 Overlay
95 x 138mm
- Exposes a 5mm border on all edges when placed over an A6 backing card.

DL Card
99 x 210mm
- 1/3 of A4. Fits into a DL envelope.
Suggested uses
- Invitation or Thank You card backing (card weight)
- RSVP 'Post card' (card weight)

DL Overlay
89 x 200mm
- Exposes a 5mm border on all edges when placed over a DL backing card.
Envelope sizes

Not all envelopes are Post Office Preferred (POP) and therefore some attract a higher rate of postage.  If the article is too small, too big or too thick to fit through their automatic sorting machinery, you get charged extra so it can be hand sorted.  If in doubt, check with your local Australia Post office.

Don't fall for the old 'make my invitations now and find an envelope to fit later' trick.  Envelopes come in standard sizes so you need to find the envelope first and make your invitations to fit.  Don't forget to make the invite a bit smaller than the envelope (at least 5mm all sides) so that it slides easily in and out.  Allow extra if the invite is bulky as the thickness will take up some of the width.

DL 
Envelope
110mm x 220mm
- Standard, business sized envelope. Designed to fit 1/3 of an A4 sheet.
(Post Office Preferred.)

C5 Envelope
162mm x 229mm
- Large envelope designed to fit A5 insert.
(Not Post Office Preferred. $1.20 postage required)
C6 Envelope
114mm x 162mm
- Standard small envelope designed to fit A6 insert.
(Post Office Preferred.)
11B Envelope
90mm x 145mm
- Small envelope usually used for RSVP cards. Fits without folding into DL, C6, 16cm square and C5 envelopes.
(This is the smallest Post Office Preferred envelope. Anything smaller incurs extra postage charges.)
16cm Square Envelope
160mm x 160mm
- Large square. Make your invitation no larger than 15.5cm square to fit inside.
(Not Post Office Preferred. $1.20 postage required)
13cm Square Envelope
130mm x 130mm
- Small square. Make your card no larger than 12.5cm square to fit inside.
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