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The backpack is a feature of the Scratch 3.0 project editor that allows users to drag and drop costumes, sprites, sounds, and scripts from other projects into it and then drag and drop them easily into their project. This can be used to create multiple copies of a script or add a script to a different project. For example, one can drag their platformer engine into their backpack to use in another platformer game they make, without the need to recreate the whole thing. The backpack is collapsible, so, if the user is not using it, it doesn't waste space. This feature is different from previous versions because even if a project is downloaded, the files used within it are not easily accessible for use in another project, and the user must export the media first. However, one can only access their own backpack, and therefore one must be authenticated (logged in) to access the above endpoint.
If a user attempts to access somebody else's backpack, they will see a 403 error. To add media to the backpack, open the backpack by clicking on the "Backpack" tag at the bottom of the screen. Then drag a sprite, sound, costume, or script fragment into it. Media can also be clicked and dragged around throughout the backpack for organization. To remove media from the backpack, right-click on or tap and hold the desired item and select "delete". The X-CSRFToken must be passed with the CSRF token (which can be found in the scratchcsrftoken cookie); and should pass a JSON payload as the body of the request, containing the desired backpack. The user must be authenticated (i.e, logged in). To add scripts to the backpack from the Discussion Forums, one would click the "Add to Backpack" button next to a script. It would ask you what the script should be named, and once you click "Okay," it will be added to your backpack.
To remove media from the backpack, in the same or another project, one can open the backpack by clicking on the tab, the same way as before. Then, one can click and drag the media out of the backpack and into the project editor. Specific types of media must be dragged into specific areas of the project editor. For example, one cannot drag an image into the sound editor, as it will simply disappear and cause no function. When dragging media from the backpack, the object is not removed from the backpack but duplicated. If an item icon has a question mark on it, it means that the item has failed to be fully be put in the backpack. It does nothing when dragged to the project. Some media can still be exported from the backpack. The backpack shows an icon or image of the media in it, along with some information about it. For a sprite, it has the thumbnail of the sprite as it was dragged into the backpack, along with the name of the sprite. For a costume, it has a thumbnail of the costume, along with the name. For a sound, it has a sound icon, along with the sound's name. For a script, it has a thumbnail of the script, and the text "Script".
At the same time, if you want a place for iPad external batteries, a keyboard, adapters, or even a portable printer and handheld scanner, plus room for a books, paper and your cell phone this is a perfect size. The ballistic nylon exterior is very tough and will keep out the rain. YKK zippers will give long service. It has quick access side pockets as well as a removable accessory pouch. Cool fact: each bag has a unique ID number which will help if it is lost or stolen. The manufacturers give a five-year warranty which is a fair reflection of the long service you can expect from a backpack of this quality. Their PR department failed by designating this as a ladies backpack. It is well designed, the leather is a good quality and the overall look is a long way from girly. Perhaps the makers think that if something has plenty of pockets and catches and there are no bull horns the guys will run? The inner pocket is lined and holds your iPad above the bottom so if you drop it there is no danger of sensitive electronics hitting hard surfaces.
The outer cell phone pocket is very convenient and the two main compartments give plenty of room for wallets, books, gloves and whatever else you like to keep close at hand. For what it offers, the price is pretty reasonable at under a hundred dollars. The MacCase can be used as a backpack or a flight case. It is made of good quality leather so durability is guaranteed. Leather is one of the best materials for protection - especially when coupled with generous padding, as it is here. There is a sturdy top handle for carrying as hand luggage- ideal for air travel. It can also be used as a shoulder bag. This bag makes organizing accessories so easy, and the results after you have completed your packing is so neat and tidy. There is no excuse for losing anything in this bag, nor should you ever find yourself tipping everything out of the bag just to find a charger! The front storage pouch can be removed and the front-flap gives instant access to smaller items.