Maybe one of these similar products would be of interest:-

4PCS Square Tube Sleeve Non-slip Square Tube Inserts Sleeve Converter For Fitness Equipment (50 * 50)

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Westmark Glass Jar with Silicone Lid – Practical Storage Jar with Lid, Ideal for Storing Pasta, Spices, Tea, Sweets, and Much More, Square, Stackable

Westmark Glass Jar with Silicone Lid – Practical Storage Jar with Lid, Ideal for Storing Spaghetti (up to 26 cm), Pasta, Tea, Spices & More, Square, Stackable