**1. Introduction**

One of the most abundant polymers on Earth is cellulose, which is the dominant constituent of plants. It is widely used in daily life in the form of wood and cotton [1–3]. Unfortunately, cellulose obtained from plants has low crystallinity and is contaminated by other polymers like lignins, pectins or hemicelluloses [4]. Such cellulose requires purification processes, which are complex and need use of toxic chemicals, energy and water. Taking the above into account, a more simple and environmentally friendly solution may be use of bacteria-derived cellulose (BC) [5]. BC is a biopolymer synthesised in the fermentation process by various bacteria of genera *Gluconobacter* or *Agrobacterium* [6–9]. The bacteria-derived cellulose is possible the strongest naturally synthesised biological material, which characterises exceptional physicochemical properties, such as high purity [10], crystallinity, water holding capacity, thermal and radiation resistance, mechanical properties, specific surface area, elasticity, relatively high mechanical strength in the wet state, hydrophilicity and excellent biocompatibility [11–15] BC is a very convenient material when it comes to modifications of its applicability since cultivation

method determines different shapes, properties and transformations [7]. Among several methods of producing bacterial cellulose, the most simple and ecological one is the use of a symbiotic consortium of bacteria and yeast popularly known as kombucha or SCOBY. Life kombucha cultures are easy to access on the global market and easy to cultivate. Kombucha does not require laboratory conditions, complex growing media or sophisticated cultivation and processing equipment. The optimal growth is obtained on the commonly used sweetened black tea infusion. Each person in the world can grow bacterial cellulose at home without special training. Obtained material is ready to use as an ecological substitute of plastics, storage bags, bandages, and even clothes.
