SUPTMAX KoffieStrawCompany Koffie Straw SURF in both sizes (2 straws: 8", 10", and a brush)

Would this with either a camelbak forge or contigo autoseal westloop?

Does this fit in a yeti cup hole?

Any tips on cleaning the inside effectively? Do you use warm, soapy water with the brush?

The mouth end appears to be a tiny oval shape ... how does the brush fit to clean? Is bottom round? Thanks.