I am assuming toilet rolls are very much the same size around the world but you can check your rolls against the following sizes.
For the basket piece cut 2 rectangles: 4 ⅜ x 12 ½ inches. I am using 2 different fabrics for the inside and the outside.
For the binding cut 2 strips of fabric: 1 ½ x 13 inches for the long side and 2 strips more: 4 ⅜ x 1 ½ for the short side.
Hanging ribbon: cut 2 pieces 11½ inches long.
Fold each strip in half and iron. Then fold each side again up to the middle of the strip and iron again (see picture below).
Place both rectangles wrong side facing together and place the binding to each of the short sides and pin (see picture).
Top stitch along the binding.
Do the same on each side.
Now apply the binding in the same way to the long sides. Fold in the end of each strip and pin.
Insert the ribbon at each end of the binding (see picture).
Detail of the ribbon and binding pinned together.
Top stitch along the binding. Stitch in a square on the ribbon corners.
And here is the finished toilet roll basket.
Sewn Up 
This is great!!! What a simple but useful idea! With a shower tea coming up this will be perfect. Thank you very much for sharing!!!
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Wow! Had guests this past weekend–always running out of toilet paper (oh the visual!). What a great, great idea. Going to make a few. Thank you!
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Finally a way to keep an extra roll in my bathroom! So clever
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I love this!!! I have a holder for 3 rolls, but never know what to do with the 4th one in a package. This will work great!!!!
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I have this type of toilet roll holder as well and I find it quite annoying that the toilet paper is always falling off the holder. (via sliding off in other words) this is the perfect idea to help keep it in place. Thank you.
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I really plan to try this because I am always running out of toilet paper!
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