A dataset of factors influencing consumer behavior towards bringing own shopping bags instead of using plastic bags in Vietnam

The dataset presents factors influencing consumer behavior towards bringing own shopping bags instead of using plastic bags in Vietnam. The survey was designed based on the theoretical integration model of theory of planned behavior (TPB) and norm activation model (NAM) including 8 factors, 25 items inherited from the studies. 7 other items were used to find out the respondent's characteristics, including: gender, age, educational qualification, marital status, job, number of family members and income. The questionnaires were sent in two forms: direct distribution and collection at some supermarkets; online survey via Google Docs tool to some consumers in Vietnam in November 2020. 536 valid questionnaires were collected to study factors influencing consumer behavior towards bringing own shopping bags instead of using plastic bags in Vietnam. The data set was collected as a reference source for later research on consumer behaviors to protect the environment in general and the behavior to bring own shopping bags instead of using plastic bags in particular.


Specifications
Consumer behavior Specific subject area Shopping bags, plastic bags, theory of planned behavior, norm activation model, Vietnam Type of data

Value of the Data
• The dataset uses the integration of two TPB-NAM theories to study factors that influence consumer behavior towards bringing own shopping bags instead of using plastic bags in Vietnam. • The dataset has collected the opinions of 536 Vietnamese consumers about a sustainable consumption behavior that is meaningful to the environment. • The data set is a reference source for the authorities to promote sustainable consumption behavior, in particular, consumption of not using plastic when shopping at the supermarket.

Data Description
Sustainable consumption is the purchase, use and disposal of products in a manner that reduces damage to the environment [ 1 , 2 ]. While consumers may understand the importance of sustainability and are willing to accept a greener option when surveyed, the actual adoption rate is surprisingly low [ 1 , 3 ]. In fact, plastic bags are no exception, although most consumers are aware that plastic bags pose a danger to the environment, but not many consumers bring own shopping bags instead of using plastic bags [ 4 , 5 ]. The use or not to use plastic bags when shopping is related to ethical consumer behavior. Ethical consumers regularly buy and use environmentally friendly products [6] . Therefore, behavior towards bringing own shopping bags instead of using plastic bags should be studied in two approaches: an approach based on a common behavior perspective, one based on an ethical perspective [ 1 , 5 ]. Therefore, the data set gathered consumer opinion based on 8 factors from the TPB-NAM integration model to study about the behavior of bringing own shopping bags instead of using plastic bags, in which, TPB explores common consumer behavior while NAM emphasizes on ethical views in consumption. In particular, TPB and NAM have been integrated and used in a number of studies on consumer behavior [7][8][9][10][11] but never used to study the behavior of bringing own shopping bags instead of using plastic bags.
The data set was collected through a 2-part survey: the first part explores the respondents' characteristics including: gender, age, educational qualification, marital status, job, number of family members and income ( Table 1 ); the second part explores respondents' consent to statements related to factors influencing consumer behavior towards bringing own shopping bags instead of using plastic bags in Vietnam ( Table 2 ); Table 3 shows more detailed results between the variables. The survey was sent to consumers through two forms: direct distribution and collection at some supermarkets; online survey via Google Docs tool to some consumers in Vietnam in November 2020. In the form of direct distribution at some supermarkets, the author observed and instructed the answer, each consumer spent about 15 min completing the survey. For the form of online survey via Google Docs tool, the author gathered emails of individuals in some agencies and organizations operating in Vietnam, then sent the survey questionnaires link directly via their email. The results obtained a total of 536 valid survey questionnaires in both forms. In which, in the form of survey at supermarkets, the author obtained 211 valid questionnaires out of the total of 235 questionnaires, reaching the rate of 89.8%; in the form of online surveys, the author obtained 325 valid questionnaires out of 600 emails sending survey questionnaire links to consumers, reaching the rate of 54.2%. The questionnaire and answers were shown in the supplementary files.

Experimental Design, Materials and Methods
The survey is done simultaneously by both direct and online forms in November 2020. With the form of direct distribution and collection at some supermarkets, the author has listed top 10 supermarkets in two big cities, Hanoi and Ho Chi Minh, with the most number of shoppers in Vietnam, then with the support of collaborators, the author conducted the survey at 9 am, 10 am every weekend at the exit of the supermarkets. With the form of online survey via Google Docs, the author makes a list of several enterprises that publish their employees' email addresses on the company's official website and randomly selects 50 enterprises with diverse business sectors, then sends the survey link to these people. Each survey participant received a prize number and 10 lucky people, randomly selected, received a supermarket shopping voucher.
The survey was designed with 32 items, of which 7 were about respondents' characteristics, the remaining 25 items, are designed on a 5-point Likert scale (1: Strongly disagree; 2: Disagree; 3: Neutral; 4: Agree; 5: Strongly agree), focus on 8 factors: behavior, intention, attitude, subject norms, perceived behavioral control, awareness of consequences, ascription of responsibility and personal norm. All items in the survey are inherited from previous studies [ 4 , 5 , 12 , 13 ]. The questionnaire is only valid when it meets two conditions: firstly, answering all questions; secondly answering two inversion questions AT1 and PN3 in accordance with results of other questions. After discarding the invalid questionnaires, the final data set contained 536 questionnaires. All respondents' responses were encrypted and imported into Excel software before importing to SPSS 22.
Based on the data set, further studies can study the relationship between factors in the TPB-NAM integration model or separate each theory to find factors influencing consumer intention and behavior towards bringing own shopping bags instead of using plastic bags in Vietnam.