Sorry for the late reply. I use an ordinary carrier bag. It's generally be used on car roof, but it's also could be used like I do. It’s just could be tied by its belt. www.amazon.co.jp/-/en/Waterproof-Polyester-Concealed-Rainproof-Instruction/dp/B07HHQDM8F?ref_=Oct_d_omwf_m_2045107051&pd_rd_w=SCsIL&pf_rd_p=a5f0d377-8158-4e6e-8a82-5cd33a9298c0&pf_rd_r=3Z2WNJ8B4EFFCZ0TPT4K&pd_rd_r=3de62354-d530-4788-89b8-78e68d398507&pd_rd_wg=MJrOm&pd_rd_i=B07HHQDM8F please find the url for your reference. It's not what I use, but you can use these prodacts as well.