I ordered a variety of sticker rolls from DHL.
Here's details on some of the options, for your reference:
A - USA Shipment Stickers (1 roll = 1000pc)
7.7 x 3.8 cm
No backing paper, stickers directly on each other on roll
B - Return Cheque Stickers (1 roll = 250pc)
7.7 x 3.8 cm
No backing paper, stickers directly on each other on roll
C - Saturday Delivery Stickers (1 roll = 1000pc)
7.7 x 3.8 cm
No backing paper, stickers directly on each other on roll
D - DHL Express Stickers (1 roll = 1000pc)
7.7 x 3.8 cm
No backing paper, stickers directly on each other on roll
E - International Stickers (1 roll = 1000pc)
7.7 x 3.8 cm
No backing paper, stickers directly on each other on roll
F - 9AM Express Stickers (1 roll = 250pc)
10.1 x 9.6 cm
No backing paper, stickers directly on each other on roll
G - Dangerous Goods Stickers/"Do Not Ship Via Air" (1 roll = 100pc)
7.5 x 7.5 cm
Backing paper
Obviously, of these options, the Dangerous Goods stickers are best, since they're the only ones with backing paper.
All the stickers have some laminate to the surface, none are flat paper.
If anyone else who orders DHLs can document theirs as well, it'd be helpful, thanks.