We have a line of products to protect timetables. This same size can be used for #10 envelopes as well as handbills.

Blue-Gray 35-mm & 120 Negative archival flip-top Storage Boxes. Made from 60 pt barrier-board.
Storage Box for Folded maps,
35-mm & 120 Negatives
4-1/2 x 10-1/2 x 5-3/8".
Acid-free, Lignin-free 60 Pt. Blue-Gray Barrier Board.

Base SKU:xnegbg

Timetable Sleeve
Timetable Sleeve 4-3/8 x 10"
2.5 mil Polyethylene.
No Flap.

Base SKU:stt25

Old Timetable Backing Board
Timetable Backing Board. 4-1/4 x 10".
.030" thick chipboard material.
White on one side. Short-term storage.

Base SKU:kcb30tt

Timetable Backing Boards
Timetable Backing Board. 4-1/4 x 10".
.028" thick acid-free material.
White both sides. Long-term storage.

Base SKU:kaf28tt