Moving boxes are a large part of every move.  They are used to pack all of your belongings into for the move to your new home.  Making sure your boxes are sturdy and of good quality is very important.  The last thing you want to is to be moving a box and have the bottom give out and have all of your items come crashing to the floor.  Other concerns you should have are particular to used moving boxes, dirty boxes.  Dirt and bacteria from the previous use can leave the moving box in poor shape and can cover all of your belongings in it during the move.  This could mean damage to items (permanently dirtied) or if there is bacteria could make you sick.  Check with your local Berkeley moving company and ask them about deals on moving supplies.