Calculated Shipping Rates Troubleshooting

Site URL: https://sashalennonpottery.com/

I sell physical goods, and I have upgraded my site to included carrier calculated shipping rates at checkout. Most of my goods require a box for shipping, but I recently started selling stickers. Stickers are flat, and don't need to be shipped in a box. I want the calculated shipping when shipping only stickers to be $0.55 (the cost of a stamp). I can't find a way to manipulate the carrier calculator to know to place the items in an envelope and not a box. 

I have tried creating a flat rate shipping option, but since I can't apply shipping options to individual products, the shipping option displays at checkout as an option for all orders. I have lost money when people ordering items requiring a box choose the sticker shipping option. I have also tried making a discount for free shipping for the stickers but, again, when people order multiple items it applies the discount to the entire order when I don't want the entire order to have free shipping. 

Please help!

Was just about to ask the same question.

Be great to be able to select for each product if it should be (1) flat rate (2) Carrier Charges (3) no charge. or at worst exclude from shipping charges.

We have a eye mask for sale at $7.50 but when a customer wants to check out the shipping is $14!!! 

Be great to have some greater flexibility.

+1 to this. Really need to add First Class as a USPS carrier option for calculated shipping!!!

I have this issue also.  Some of my products can go in envelopes but there isn't that option for calculating shipping cost.

Same issue here.  Does Squarespace even come in to read the forums?

hi guys, has any of you found a solution? would you mind to share, pretty please? 🥰

Thanks