Best thing to do is to pop down to your local bicycle shoppe and ask them for an old bike box,they usually have a few.
Next,strip the bike down so the bars/forks/wheels and pedals are removed[with the bars just leave the cables attached and wrap it inside the front triangle]
Put everything in said box-If theres still room at one end bring out the stanley knife[ask an adult if unsure better still someone sensible
cut the box so you can push one end closer and a roll of sticky later you have a smaller box.
Pack and voids with foam,bubblewrap,newspaper or anything else you can think of to brace it and stop the box from collapsing if handled roughly
[I find rolled up lengths of cardboard placed at right angles to the bike and sticky'd in the best way to support it]
Seal it up,address it and take it to the postoffice to be weighed[you dont have to say your actually going to send it with them but only getting a weight/cheapest PO price bu8t dont tell them that till theyve weighed it
Info on weight and dimensions in hand its time to phone around to get the best price,or online price checker on the couriers website.So much easier.
Where sending,get the company's[PO,whatever] fragile stickers put on,dont just write fragile-Thats an invite to the human mind
1976 Raleigh Chipper,1991 Muddy Fox Adventurer, 1992 Raleigh Diablo ,1992 Rudy Project, 1995 Cannondale M200 ,1997 Santa Cruz Tazmon ,1997 Specialized Stumpjumper ,1997 Specialized Rockhopper ,1997 Marin Quake 9.0,1998 Marin Pallisade trail ,1998 Raleigh Torus,1999 Orange Clockwork , 2005 Kona Hahanna , 2010 Orange Pure7
The Marvellous Mechanical Hope Collection