Frankly I would wait another week or two and then you won't have to use heat packs to most areas. I use insulated boxes, put the shrimp bag in first, cover the bag with packing material, and tape the heat pack to the underside of the lid. The red line of the heat pack has to be facing the inside of the box and needs to remain tape free. Also if you do this a lot, I would recommend using Kordon breather bags. Sometimes boxes get lost and I had shrimp survive a week in transit using Kordon bags.
Use fresh de-chlorinated water matching the TDS to the TDS of your tank water, add some sort of live plant for the shrimp to hang onto and only fill the bag half full with water, the rest with air.
20g L46/hastatus/pygmy corys, 10g OEBTs, 10g blue bees/blue velvet shrimp, 10g CRS, 25g L174s/BNs/L340s, 10g yellow/red tiger shrimp, 15g clown plecos/CPDs/habrosus corys, 15g cory fry, 29g Weitzmani/panda corys/BNs, 46g L134s/salt and pepper corys/BNs/rubberlip pleco, 55g SAE/L201s/L199s/BNs/kissing gourami, 75g L316s/BNs/L134s/CAE/silver dollar, 30g L340s/L211s/CPDs,10g tangerine tiger/snowball shrimp, 20g L134/habrosus corys, 10g CPD fry