The delivery decision here is dominated by one object: the bat.
Bats
Long, and most couriers price on length as well as weight. Some services add a surcharge, some refuse the parcel outright, and the rules differ between carriers.
Check what yours does before the show. If you quote a delivery price and the counter charges more, the difference comes off your own balance rather than the buyer's. How delivery is charged.
Shirts, caps and paper
Easy. Light, flat, a weight rule, a moisture barrier, tissue over any signature. Packing cricket memorabilia.
Frames
Do not post glass. Offer collection or send the item unframed.
The four options
Courier for everything except bats you have not checked and anything framed. Your own delivery locally, which works well for larger signed pieces. Pickup for bats, frames and high-provenance items. Buyer arranges for the awkward ones.
When collection is the honest answer
For bats, frames, and anything where the provenance makes it irreplaceable. Agreed before bidding, with a collect-by window. How pickup works.
Combining wins
A shirt and a programme combine. A bat and anything do not. Combining is on by default with whatever you set for each later win — set it thinking about the bat.
Questions people ask
Can I post a stump or a signed ball?
Yes, boxed and padded, with nothing resting on the signature.
Is a tube acceptable for a bat?
No. A long box, with the extremities padded.
What about the monsoon?
A sealed bag inside the parcel, every time. Monsoon and your stock.