Bundling together items to meet baggage allowance?

Some airlines allow only 1 item as your baggage allowance. If you are travelling with two or my items of checked luggage, and their combined weight is still below the weight limit, do airlines generally allow you to kind of bundle them together with a length of rope or similar and count it as 1 item?
In my case I have some flights booked on Lufthansa and Singapore airlines, and I'm travelling with my guitar case and my backpack. I'm well under the weight limit, but I fear I will be charged a hefty fee for the extra item and there is not any option to pre-purchase additional luggage on my fare. I want to know if I should bother attempting to tie my backpack to my guitar case and call it 1 item, has anyone had experience either success or failure with this?
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Can you combine baggage allowance?
Usually, combining the checked luggage allowance is allowed only between passengers on the same booking. This means that not only do you have to be on the same flight, but also share the same booking number. Normally, it doesn't matter if you're related or not, as long as you share the same booking number.How do I maximize my baggage allowance?
Travelers have many tools at their disposal to maximize their savings on baggage fees:Can check-in baggage be two pieces?
Additional Piece(s): Additional pieces (subject to a maximum of 2 pieces) of Baggage may be pre-booked at a charge of INR 750 per piece. At the airport, the same will be chargeable at a rate of INR 1000 per piece. Additional charges may apply for excess baggage at the airport.What is the meaning of baggage allowance 2 pieces?
If your flight ticket is marked with the code \u201c1 PC\u201d, you may take one piece of baggage weighing a maximum of 23 kg. If your flight ticket is marked with the code \u201c2 PC\u201d, you may take two pieces of baggage, each weighing a maximum of 23 kg.🛑AIRLINE BAGGAGE POLICY | 5 THINGS YOU MUST KNOW! Free Baggage, Prohibited Items, etc
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